Aero-Seal worm-drive hose clamp with a hex screw that can be tightened with a socket head or screwdriver. Heavy duty 4 piece Quadra-Lock construction enables far more tightening torque to be delivered to the band perforations. The 9/16 wide band provides wider sealing pressure and is used most often in aircraft. Meets SAE standard J1508 type "F". Clamp is used with firm hoses.