Package includes: 3 pieces 8 mm shank keyhole router bit set, 5/16, 3/8 and 1/2 inch in blade diameter.T-type high-grade straight edge blade, sharp edge, high hardness, accurate positioning, high precision, smooth cutting.High-grade YG6X carbide tipped provides increased strength and utmost resistance, solid hardened steel bodies with anti-kickback design.Alloy blade with high-grade welding, stable quality, high efficiency. Long service life.Perfect T-slot cutters to DIY keyhole slots for picture frames, shelves, mirrors, cabinets, support fixtures and other wall hangings.Produktbeschreibung Package includes: 3 x keyhole router bit. Warm tips: 1. Please always notice to add some coolant (like water) when operating, in case the material temperature will get very high even get smoke because of the long time operating. 2. When the woodworking is blunt, please replace the new tool, do not continue to use to avoid cutting tool breakage and injury accident. 3. When using the cutting tool, please select the blade length is greater than the work article. 4. When operating, the user is asked to wear safety glasses. 5. The cutter is sharp enough, please get away from children. 6. Please allow 0-1 mm error due to manual measurement.