The 1/2" band and housing components are all stainless steel and the slotted 5/16" hex head screw is made from 400 series stainless steel. Recommended for good corrosion resistance and extra strength. Rounded edges to protect the hose. Efficient three-piece construction. Screws feature deep slots for quick installation. Precision Brand® Standard Series Hose 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.