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.ectSpecifications:Material:steel，plasticColor:black，silverGrinding head diameter: 3.175 mmLocating cover size:60x42cmInstallation steps:1.Screw down nut， install the woodworking cutter2.Install the cutter locator3.Adjust the milling cutter to the same plane as the locator， and remember to adjust the scale.4.Adjust depth according to demandPackage include:1xLocating cover4x3mm drill6x Wood Miller