---
product_id: 432346534
title: "Flex-Hone Brush Research GB Standard Duty Flex Hone for Block Cylinders, Aluminum Oxide, 3-1/2\" Diameter, 240 Grit (Pack of 1)"
brand: "flex-hone"
price: "€ 271.03"
currency: EUR
in_stock: true
reviews_count: 5
category: "Flex Hone"
url: https://www.desertcart.com.cy/products/432346534-flex-hone-brush-research-gb-standard-duty-flex-hone-block
store_origin: CY
region: Cyprus
---

# 240 grit aluminum oxide for smooth finish 3.5" diameter precision fit Made in USA, durable & cost-effective Flex-Hone Brush Research GB Standard Duty Flex Hone for Block Cylinders, Aluminum Oxide, 3-1/2" Diameter, 240 Grit (Pack of 1)

**Brand:** flex-hone
**Price:** € 271.03
**Availability:** ✅ In Stock

## Summary

> ⚡ Hone like a pro — flawless finishes, zero hassle!

## Quick Answers

- **What is this?** Flex-Hone Brush Research GB Standard Duty Flex Hone for Block Cylinders, Aluminum Oxide, 3-1/2" Diameter, 240 Grit (Pack of 1) by flex-hone
- **How much does it cost?** € 271.03 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.cy](https://www.desertcart.com.cy/products/432346534-flex-hone-brush-research-gb-standard-duty-flex-hone-block)

## Best For

- flex-hone enthusiasts

## Why This Product

- Trusted flex-hone brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Optimized for Softer Metals:** 240 grit aluminum oxide excels on aluminum, brass, bronze, and Nikasil cylinders
- • **Durability That Saves You Money:** Long-lasting brush reduces replacement frequency and overall costs
- • **Self-Centering & Self-Aligning Design:** Effortless use with automatic alignment and wear compensation
- • **Precision Fit for Perfect Bore Finishing:** 3.5-inch diameter designed for exact block cylinder honing
- • **Versatile Finishing & Deburring in One Step:** Simultaneously finish and deburr crossholes with a single tool

## Overview

The Flex-Hone GB Standard Duty Brush is a 3.5-inch diameter, 240 grit aluminum oxide honing tool made in the USA. Engineered for block cylinders and liners, it features a self-centering, self-aligning design that ensures consistent, high-quality finishes while reducing total cost of ownership. Ideal for finishing and deburring softer metals like aluminum and Nikasil-coated surfaces, this tool delivers professional-grade crosshatch finishes in a single, efficient step.

## Description

The GB Series Flex-Hone tool is designed for bore 3-1/2" diameter and 13-1/2" Overall length. This standard duty Flex-Hone tool is commonly used to finish and deglaze block cylinders or liners and represent a tremendous value on a cost per cylinder basis. 240 Aluminum oxide grit.

Review: Did the job very well and fast, but did loose a few balls
Review: Worked great honing the nikasil cylinders on my Yamaha GP1300r jetski

## Features

- [QUALITY]- Proudly made in the USA. The FLEX-HONE is long lasting, lowering total cost of use compared to other brush options.
- [DESIGN]- The FLEX-HONE is manufactured to be self-centering, self-aligning and self-compensating for wear for easy use.
- [FINISHING BENEFITS]- Offered in a wide variety of grits and abrasives to allow machinists to achieve specific finishing tolerances as well as a beautiful crosshatch finish.
- [CROSSHOLE DEBURRING]- Ideal for finishing and deburring simultaneously in a single setup. Can be used in virtually any rotating spindle.
- [ALUMINUM OXIDE ABRASIVE]- Excellent on aluminum, brass, bronze, and softer non-ferrous materials. 240 AO is commonly used for deglazing Nikasil cylinders.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B007INTIYG |
| ASIN  | B007INTIYG |
| Batteries Included? | No |
| Batteries Required? | No |
| Color | gray |
| Customer Reviews | 4.6 4.6 out of 5 stars (62) |
| Customer reviews | 4.6 4.6 out of 5 stars (62) |
| Cutting Diameter | 3.5 Inches |
| Date First Available | 1 January 2024 |
| Date First Available  | 1 January 2024 |
| Grit Rating | 240 |
| Grit type | 240 |
| Included components | GB 3-1/2" (89MM) 240AO FLEX-HONE |
| Item Package Quantity | 1 |
| Item Weight | 340 g |
| Item diameter | 3.5 Inches |
| Item model number | GB312240AO |
| Item model number  | GB312240AO |
| Manufacturer | Brush Research Manufacturing |
| Manufacturer  | Brush Research Manufacturing |
| Measurement System | Inch |
| Number of pieces | 1 |
| Part number | GB312240AO |
| Product Dimensions  | 8.89 x 8.89 x 0.25 cm; 340.19 g |
| Recommended uses for product | Finishing, Deburring, Crosshole Deburring |
| Set Name | No Set |
| Size | 1/2" |
| Style | 240 GRIT |
| UPC | 843469142979 |

## Product Details

- **Brand:** Flex-Hone
- **Bristle type:** Crimped Wire
- **Colour:** gray
- **Grit material:** Aluminium
- **Material:** Aluminium Oxide

## Images

![Flex-Hone Brush Research GB Standard Duty Flex Hone for Block Cylinders, Aluminum Oxide, 3-1/2" Diameter, 240 Grit (Pack of 1) - Image 1](https://m.media-amazon.com/images/I/61f9Ueb7-8L.jpg)
![Flex-Hone Brush Research GB Standard Duty Flex Hone for Block Cylinders, Aluminum Oxide, 3-1/2" Diameter, 240 Grit (Pack of 1) - Image 2](https://m.media-amazon.com/images/I/81UerHm4ZeL.jpg)
![Flex-Hone Brush Research GB Standard Duty Flex Hone for Block Cylinders, Aluminum Oxide, 3-1/2" Diameter, 240 Grit (Pack of 1) - Image 3](https://m.media-amazon.com/images/I/71LI+vNqxIL.jpg)
![Flex-Hone Brush Research GB Standard Duty Flex Hone for Block Cylinders, Aluminum Oxide, 3-1/2" Diameter, 240 Grit (Pack of 1) - Image 4](https://m.media-amazon.com/images/I/81aPGQTXemL.jpg)
![Flex-Hone Brush Research GB Standard Duty Flex Hone for Block Cylinders, Aluminum Oxide, 3-1/2" Diameter, 240 Grit (Pack of 1) - Image 5](https://m.media-amazon.com/images/I/81X4pgWlJtL.jpg)

## Available Options

This product comes in different **Size, Style** options.

## Customer Reviews

### ⭐⭐⭐⭐ Review
*by M***N on 31 October 2025*

Did the job very well and fast, but did loose a few balls

### ⭐⭐⭐⭐⭐ Review
*by A***I on 26 October 2025*

Worked great honing the nikasil cylinders on my Yamaha GP1300r jetski

### ⭐⭐⭐⭐ Review
*by S***Y on 9 December 2022*

Item works good but I can't seem to get the hatched effect yet. I'll keep trying.

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*Product available on Desertcart Cyprus*
*Store origin: CY*
*Last updated: 2026-03-08*