ITEM NAME:Watch Jewelers Repair Sharpener Watchmaker Tools Screwdriver Sharpening Guide BX Features: Can hold handles from 2.5mm to 5mm(0.1"-0.20") in diameter. Adjustable screw holds precision screwdriver in place at the proper angle for sharpening. Great for sharpening precision screwdrivers,fixing damaged blades,etc. How to use: 1.Place screwdriver through center of sharpener. 2.Adjust screw to securely hold in place. 3.Roll sharpener back and forth over a sharpening stone. Package included: 1x Screwdriver Sharpener (Screwdivers Not Included).Roll sharpener back and forth over a sharpening stone. Place screwdriver through center of sharpener. 1x Screwdriver Sharpener (Screwdivers Not Included). Adjustable screw holds precision screwdriver in place at the proper angle for sharpening.