Yoke allows 2 or 3 hole application. Alloy steel center screw with floating, removable swivel. Applies even pressure, preventing damage. Drop forged, heat treated carbon steel. Includes – 1 pc 5″ alloy steel pressure screw 3/4″-16 thread, 1 pc small centering adapter, 10 pc bolt sizes (2 pc 5/16″ x 4″, 2 pc 1/4″ x 3″, 3 pc 1/4″ x 2″, 3 pc 5/16″ x 2″). Includes blow mold storage tray.