Brass roller with retaining ring, open end: Brass roller design, back and back without restriction when sharpening, maintains constant orientation, non-slip, smooth, safe. Brass disc with retaining ring, open end. Make sure the rollers are not offset when sharpening the knife, they must always be centered. Adjustable clamping width: The clamping width can be adjusted by turning the nut. Clamping width range: 8-82 mm. Maximum clamping width for flat surfaces: 82 mm. Maximum clamping width of chisel: 58 mm. Fine and solid workmanship: Made of high quality stainless steel, not easy to rust, solid and durable. Fixed angle, easy to use. Turn the nut counterclockwise, install a chisel or other tool, install and adjust the angle. Then tighten the screw cap clockwise, with the edge of the blade firmly seated on the wheel or sharpener, and rub the knife back and forth until your tool is sharper and sharper. Widely Used: Suitable for grinding wood chisels, planes, blades, scissors, carving knives, planing irons, flat chisels. It must be a good partner for a chisel that helps you have a sharp blade. Saves you energy but works perfectly. Specification: Material: Stainless steel + brass. Clamping width: 8 mm - 82 mm. Product weight: 270 grams. Dimensions Dimensions: 9.7 x 4 x 4 cm.