This SK11 board file spare blade works well for chamfering and shaping a variety of materials with its sharp teeth and small holes that prevent clogging for effective grinding. This blade has a slightly curved design, allowing for light and smooth cuts. This tool can be used in either a push or a pull stroke depending on which way the blade is attached to the body.This blade can be installed easily and used on wood, calcium silicate board, and plasterboard. Simply loosen the screws and hook the L-shaped metal fitting on one side of the blade into the opening on the front of the main body to connect the blade. Hook the other blade end, then retighten the screw.Approximate dimensions & product data:• Size: 140x42mm• Material: Carbon tool steel SK7• Compatible body: SK11 SRC-1This listing is for the spare blade only. SK11 SRC-1 board file is sold separately.Made in TaiwanPlease note: Make sure to exercise caution when installing the blade, as mishandling the blade may cause injury. Cut-proof gloves and garments are recommended.