Using for hand-making or woodworking Industrial Quality Router Bits The blade is made of high quality tungsten steel alloy forging blade, body is made of titanium steel material(HSS) Build-up & Heat Resistant Coating Baked on heat resistant coating prevents build-up of sawdust, resin, and pitch. Industrial grade micro grain carbide blade Specification: Material: Tungsten steel alloy Shank Diamter: 8mm( 5/16") Total Lenght:45.5mm/ 1.8'' Cutter Diameter(Chose):10mm, 11mm, 12mm, 13mm,14mm,15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 22mm, 25mm, 28mm, 30mm, 32mm Package Includes: 1 Piece Router Bit Note: The color may have different as the difference display, pls understand. Please allow 1-3mm error due to hand test. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.