KT-51066/12N… Sold by the Each. Die Cast Metal Disc 15mm diameter x 12mm long for 5/8″ thick wood. Die cast eccentric disc fit into hole on horizontal member. Dowels fastened to the side wall enter the horizontal member through a side hole and fasten with a twist of the screwdriver! The Versatile Mini-Lok assembly. Use with patented gripper dowels and bushings which are sold separately. Use either Dowel KT-51068N wood screw version or use KT-51069N machine screw version with PT-78W nylon bushing or KT-82P expansion bushing.