Package includes: 3 piece 8mm shank set, 5/16, 3/8 and 1/2 inch in blade diameter. T-type high-quality straight edge blade, sharp edge, high hardness, accurate positioning, high precision, smooth cutting. High quality YG6X carbide tip provides increased strength and ultimate resistance, solid hardened steel bodies with anti-kickback design. Alloy blade with high quality welding, stable quality, high efficiency. Long service life. Perfect T-slot cutters for DIY keyhole holes for picture frames, shelves, mirrors, cabinets, support fixtures and other wall accessories. The package including: 3 x Keyhole Router. Warm Tips: 1. Please always note to add some coolant (such as water) during operation , in case the material temperature becomes very high even if there is smoke due to the long operation time. 2. When the woodworking is blunt, please replace the new tool, do not continue to use it to avoid the cutting tool break and be damaged. 3. When using the cutting tool, choose the length of the blade greater than the work item. 4. During operation, users are advised to wear safety glasses. 5. The cutter is sharp enough, please keep away from children. 6. Please allow 0-1mm error due to manual measurement.