The 1/2" band and housing components are all stainless steel. The slotted 5/16" hex head screw is made from 400 series stainless steel. Good corrosion resistant and extra strength. Rounded edges to protect the hose. Efficient three piece construction. No Spot welds to corrode. Easily installed with screwdriver, nut driver or socket wrench. Deep slotted screws. Meets SAE Torque specifications.Clamps have 100% interlock construction features: one piece housing which directly locks into the band and spot weld free design. Easily installed with screwdriver, nut driver or socket wrench. Meets or exceeds SAE torque specifications.