Description: (Black) Drill limited , clamping device, positioner, works with both standard and brad-point bits Setscrew type collar will not damage bits, positively locks anywhere along the bit, hardened and tampered (Yellow) Top and bottom bearing router bit, great for all your large stock trim applicatons This bit can be used with either a top or bottom template, especially useful for template work when routing rounded or curvy wood with sensitive end-grains. The top and bottom bearings allow you to flip over the wood stock when you reach"up-grain" and rout that segment in a "down-grain" direction, maintaining uniform smoothness around the work-piece. Specification: (Black) Shaft Chuck+Hex Wrench: Material: High Carbon Steel Size: Approx. 3, 4, 5, 6, 8, 10, 12, 16 mm/ 0.12, 0.16, 0.20, 0.24, 0.31, 0.39, 0.47, 0.63 inch (Yellow) Top Bottom Bearing Router Bit: Material: Body: Solid Hardened Steel Nose of tool: Grain carbide Total length: Approx.76.2mm/ 3 inch Bearing Outer Diameter: Approx. 1/2" Cutting Height: Approx. 1" Shank Diameter : 1/4" Package Includes: 8 Pieces of Drill Bit Depth Stop Collar 1 Piece of Hex Wrench 1 Piece of Flush Trim Router Bit