Dovetail bits, two spline, 6.35mm(1/4") shank with shank mounted bearing guide.(Please receive promo code on product page at checkout to get cheaper price.) Black Router Bit - Cutting Angle: 10; Cutting length: 12.7 mm( 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: 14.3 mm (9/16 inch); Total length : 63.5mm(2-1/2"); Compatible with dovetail jigs, fence systems or common automatic CNC routers. Cut all materials composites, plywoods, hardwoods and softwoods. Yellow Size: Shank Diameter: 6.35mm(1/4") Cutting length: 15.9mm(5/8") Depth of Cut: 14.28mm (9/16") Total Length: 63.5mm(2-1/2") Bearing Diameter: 12.7mm (1/2") Black Size: Stem Diameter: 6.35mm(1/4") Cutting length: 12.7mm(1/2") Depth of Cut: 12.7mm 1/2") Total Length: 58.76mm(2-5/16") Bearing Diameter: 12.7mm(1/2") Contents: 2 Set Dovetail Bearing Router Set Shipping Quantity: 2 pieces