The high quality 300 series 1/2 in band and housing are matched with a 300 series 5/16 in hex head screw. This clamp is highly corrosion-resistant, well suited for marine applications and is low in magnetic permeability. Rounded edges to protect the hose. Efficient 3-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.