PTFE coating effectively prevents damage. And the shank router bits allow high hooks and cutting angles. With these shank router bits, you can smoothly cut into clean, chip-free wood. Besides, the bearings are fully enclosed and lubricated. Made of high quality hard alloy material, the woodworking milling cutter is anti-rebound and durable. The shank diameter of the shank router bits is 8mm. The shank router bits are suitable for hand making a drawer or other woodworking. Item Name: Door/Window Frame Milling Cutter Material: Hard Alloy Application: Used For Mortise Connect of Doors And Windows Size Details: Shank Diameter: 8mm//0.31" (Approx.) Concave Type: 28 x 57.5mm/1.1" x 2.26" (Approx.) Anti-concave Type: 35 x 60mm/1.38" x 2.36" (Approx.) T Type: 32 x 55mm/1.26" x 2.17" (Approx.) Notes: Due to the light and screen setting difference, the product's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 3 x Shank Router Bits