Improved Wood Chisel Sharpening Guide: The new design with three upper reinforcement screws perfectly solves the problems of the first generation. The middle long screw firmly grips the chisel to prevent it from lifting, tipping or falling. Loosen the two short screws to adjust the position of the long screws left and right. Extension roller design: Through the enlarged roller at the bottom, you can scroll the wheels for sharpening easily your scissor. Wider wheels increase stability and maintain the correct angle at all times, ensuring rigorous and smooth work. Optional sharpening angles: Place the blade in the sharpener, rotate the button to adjust the width of the clips, loosen the two short reinforcement screws at the top without any resistance. The bottom and top clips are suitable for blades and scissors, choose a suitable position according to your needs. Note: The data are all manually measured, please allow 1-3cm error due to Light and display differences, there may be color differences, please refer to the actual item received.