PowerTec71013 Sharpening Stone Holder, 140 mm x 230 mm | 5-1/2-Inch to 9-Inch

Fits and holds my Naniwa Pro sharpening stone perfectly. Grips on both stainless steel drainer and laminate kitchen worktop. Easy to recommend at this price. However, the grinding slurry that gets into all the metal parts will wear away the chrome leaving the steel prone to rust (stainless would be better but there's none available). I greased the threads before use to help resist moisture and abrasion.

Does what it says on the tin. I always make sure it’s dry before I put it away as the threads can get a bit rusty

Excellent