【Optional Grinding Angles】Adjust the distance between the top of the chisel and the honing guide to obtain a standard grinding angle. Please refer to our angle chart and measure the length with a ruler before use. 【Upgrade grinding aid chisel】Design sharpening holder with three top reinforcement screws, the middle long screw fits tightly on the chisels to prevent it from lifting, tipping or falling. Loosen the two short screws to adjust the position of the long screws on the left and right. 【Extended Roller Design】With the widened roller on the knife sharpener honing bottom, you can easily roll back and forth to sharpen your chisel easily. Wider wheels increase stability and maintain the correct angle all the time to ensure your work is carried out strictly and smoothly. 【Excellent Compatibility】The chisel sharpener fits chisels or planes from 0 to 6.6 cm wide. Place the blade into the chisel sharpener, turn the knob to adjust the width of the clips, loosen the two short reinforcement screws on the top without any resistance. Both the bottom and top clips are suitable for blades and chisels, choose a suitable position according to your needs. 【Durable All-Metal Material】This knife sharpening aid is made of CNC machined anodized aluminum alloy, which makes it rustproof, will never get rust after years of use. We offer 24/7 customer service if you have any questions., Manufacturer: SYH&AQYE