The 1/2" wide #304 stainless steel band fits hoses from 3 1/2" – 4 1/2" (91 - 114 mm) in diameter. Oversize stainless-steel key-style turn closure for installation without tools ensures a good repair with a tight fit Clamps should be doubled up on both ends of the hose. One with the key/screw on the left, and one on the right. Oversize stainless-steel key-style turn closure for installation without tools ensures a good repair with a tight fit. 304 Stainless Clamps Item # 328, 149 To 161 Millimeter (mm) Opening Size 316 Stainless Steel One Bolt Hose Clamp On Seal Fast, Inc Thumb Screw Clamp No Tools The sturdy and dependable Band-Seal® line of mechanical compression couplings and bushings have been in use for over fifty years. They continue to be the choice to join clay pipe and to join clay pipe to other types of pipe Clamp, key, band, screw mechanism, and housing all made from #304 stainless steel. The 1/2” wide #304 stainless steel band fits hoses from 3 1/2” – 4 1/2” (91 - 114 mm) in diameter. Band Style 3- 4 (78-101 mm) Diameter x 1/2 Wide Easy to Use - Integral steel thumb screw mechanism allows for one hand tightening of the clamps in confined spaces to provide a leak proof seal.