Precision Brand® Quick Release Hose Clamps are made of 1/2 inch 300 series stainless steel band and housing. They also have a 5/16″ zinc plated hex head screw. Lastly, each Quick Release Worm Gear Hose Clamp has a 400 series stainless steel bridge. Use them in tight spaces when hose clamps need to be engaged and dis-engaged frequently. Using Quick Release Hose Clamps saves you time and effort.