Brass Roller with Retaining Ring, Open Part: Brass roller design, back and forth without restriction when sharpening, keep the same direction, non-slip, smooth, and safe.Brass roller with retaining ring, open part. Make sure the rollers are not offset when sharpening, always keep them centered.Adjustable Clamping Width: Can adjust the clamping width by turning the screw cap. Clamping width range: 8-82mm.Maximum clamping width of the plane: 82mm.Maximum clamping width of the chisel: 58mm.Finely crafted and durable: Made of premium stainless steel, not easy to rust, durable and strong.Fixed angle, easy to use. Turn the screw cap counterclockwise, attach 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 sharpener, rub the knife back and forth until your tool is more precise and sharper. Widely Used: 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. Saves you energy, but works perfectly. Specifications: Material: Stainless Steel + Brass. Clamping Width: 8mm 82mm. Product Weight: 270g. Item Size: 9.7 x 4 x 4cm. Package Contents: 3 x Chisel Sharpening Guides. 1 x Instruction Manual.