CMT 811.001.11 3-piece Plywood Groove Set in Carrying Case, 1/4-Shank Contains 3 straight bits featuring 15/64, 31/64 and 23/32-Inch diameters For making perfectly matching joints on plywood Super-strength superior steel, Non-Stick Orange Shield Coating. 2 SinterHip Hi-Density Industrial Chrome Carbide cutting edges CMT bits were rated the best overall in comparison to other brands (Test by Wood Magazine)