Dovetail bits, two flutes, 6.35mm(1/4") shank with bearing guide mounted on the shank.(Please get the promo code on the product page when purchasing to get a better price.) Black Router Bit - Cutting Angle: 10; Cutting Length: 12.7mm( 1/2"); Cutting Depth: 12.7mm( 1/2"); Overall Length: 59mm(2-5/16"); Yellow Router Bit - Cutting Length: 15.9mm(5/8"); Cutting Depth: 14.3mm(9/16"); Overall Length: 63.5mm(2-1/2"); Compatible with common dovetail jigs, fence systems or CNC routers. Cuts all composite materials, plywood, hardwood and softwood. Yellow Size: Shank Diameter: 6.35mm(1/4") Cutting Length: 15.9mm(5/8") Cutting Depth: 14.28mm(9/16") Overall Length: 63.5mm(2-1/2") Bearing Diameter: 12.7mm(1/2") Black Size: Shank Diameter: 6.35mm(1/4") Cutting Length: 12.7mm(1/2") Cutting Depth: 12.7mm 1/2") Overall Length: 58.76mm(2-5/16") Bearing Diameter: 12.7mm(1/2") Contents: 2 Set Router Bits Dovetail Bearing Set Quantity delivered: 2 pieces becomeveryrich