About this item Possibility to adjust its clamping width by turning the screw cap. Clamping width range: 8 to 82mm. Maximum planer clamping width: 82 millimeters. Maximum chisel clamping width: 58mm. Brass roller, back and back unrestricted when sharpening, keep the same direction, non-slip, smooth and safe. Design with retaining ring and open part. make sure the rollers are not offset when sharpening, they should always stay centered. Turn the screw cap counterclockwise, fasten the chisel or other tools, mount it and adjust the angle. Then tighten the screw caps clockwise, the edge of the blade is firmly fixed on the grinding wheel or on the sharpener, rub the knife back and forth until your tool is more precise and sharper. Suitable for sharpening wood chisel, plane, blade, chisel, carving knife, plane iron, flat chisel. It must be a great partner to help you have a chisel with a sharp blade. You save energy, but work perfectly. Finely Crafted and Durable: Made of premium stainless steel, not easy to rust, durable and strong.