For the Keller Dovetail templates and certain Incra applications, 7° dovetail bits are required. (Bits for the Keller system are supplied with shank-mounted bearings.) this angle is also used in cutting Stair stringers., #45838, diameter (D) 17/32, angle (a°) 7°, cutting Height (B) 25/32, shank (D) 1/2, overall length (L) 2-3/16, Type Porter cable jig 4210 & 4212, flutes 2, Carbide Tipped Dovetail 7 deg X 17/32 dia x 25/32 x 1/2 inch Shank