The 1/2 in band and housing components are all stainless steel and the slotted 5/16 in 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 3-piece construction. Screws feature deep slots for quick installation. Precision Brand(R) Standard Series Hose Clamps have 100% interlock construction.