Item Type: Trim Bit Material: Tungsten Steel Alloy Uses: For woodworking grooving or other woodworking Surface Coating: PTFE Coating Shank Diameter: 1/4in 1For Woodworking: This cutter is suitable for trimming and chamfering of various woods. Chamfered flats quickly eliminate edges and are easily and quickly compatible with other drills, making your job easier and more accurate. 2Tungsten Steel Alloy Material: Made of thickened tungsten steel alloy material, after oxidation treatment, this cutter is strong and wear resistant, comes with long life span. 3Adjustable Depth: Our cutter are equipped with adjustable screws to adjust the cutting depth according to actual needs. It also can lock the blade in place, preventing it from wobbling for a smoothly and accurate cut. 44Pcs: There are 4 pieces cutters in the package of different sizes that you can choose the suitable cutter according to your own needs, very practical! 5Fine Workmanship: The cutter is well made with incisive edge that the sawdust can be removed quickly.1. Please avoid cutting metal and non wood materials such as steel, iron and sand. 2. The cutter body of the milling cutter is 45 gauge steel, please keep it away from water to avoid rust. 1 x Trimming Bit 1/4 x 1/4 x 20 1 x Trimming Bit 1/4 x 5/16 x 26 1 x Trimming Bit 1/4 x 3/8 x 30 1 x Trimming Bit 1/4 x 1/2 x 30