Made from 6061-T6 aluminum. Standard 1" bore for 1" rudders,1/4" keyway, 3/8" clamp hole for rudder, Top cable clamp features two milled in scallops to help "bite" into the standard 3/16" cable. Top clamp has a built in clearance, when tightened onto steering cable it will be flush with the top surface. Supplied with 2x 1/4" stainless steel bolts that screw into 2 heli-coiled holes installed into the quadrant. Also supplied will be 2x 1/4"-20 lock nuts and washers for safety.