Specifications: Material: steel+plastic Grinding head diameter: approx. 3.175mm Locating cover size: approx. 60 x 42mm Position cover for fixing drill grinders, milling cutters, tools, grinders with tool with screw, can be directly to the card holder in rotary grinders, and positioning Bit usage: suitable for wood, plastics and other soft materials, carving, engraving, hollowing, chamfering, slotting, reaming, etc Installation steps: Screw down nut, install the woodworking cutter Install the cutter locator Adjust the milling cutter to the same plane as the locator, and remember to adjust the scale Adjust depth according to demand Package included: 1 x locating cover 4 x drill bits 6 x wood miller burrs