The high quality 300 series 1/2 inch band and housing are matched with a 300 series 5/16 inch 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 three-piece construction. Screws feature deep slots for quick installation. Precision Brand Standard Series Hose Clamps have 100% interlock construction.