【Brass Roller Wheel With Open-End Retaining Ring】Brass roller design, move back and forth without restriction when sharpening, keep the same direction, anti-slip, smooth, and safe. Open-end retaining ring design, make Sure that the rollers are not offset when sharpening, always stay centered. 【Adjustable Clamping Width】 Can adjust Its clamping width by rotating the screw-cap. Clamping width range: 0.32-3.22'' / 8-82mm. Plane Iron max clamping width is 82mm / 3.22'', chisel max clamping width is 58mm / 2.28''. 【Exquisite Made & Durable】 Made of high quality stainless steel Material, Not easy to rust, lasting and durable. 【Fixed Angle, Easy To Use】Turn the screw cap counterclockwise, clamp your chisel or tther knife tools, move up and down to adjust the angle.Then tighten the screw cap clockwise, blade edge is smoothly fitted to the whetstone or knife sharpener, slide the knife back and forth until your tools be more precise and sharpen ! 【Used Widely 】 Fit for Wood Chisel, Planer,