Timberline TRS-230 Shaker Raised Panel 1/2 Shank Door Making Router Bit Set with Back Cutter, 3-Piece For 5/8-Inch to 7/8-Inch material Carbide Tipped, Professional Quality 1/2-Inch Shank Includes Timberline and reg; No.440-16: 1-3/4-Inch Diameter 2-piece Shaker Pattern/Cope Cutters and No.420-54: 3-1/2-Inch Diameter Shaker Raised Panel with Back Cutter.