2 Sliding Screws. 13 Bushings. 2 x Sliding Screws. Sliding Screw Size: 7.5 x 0.75 in. Sliding Screw Type: 16 NAT. 13 x Bushings. Double Sliding Screws. Two 8.8-grade sliding screws provide maximal torque to ensure quick and easy operation while their precision threading prevents any slippage as you work.