Advanced Design - Key tensioner style stainless steel band. Clamp, band, screw mechanism, and housing all made from #304 stainless steel. | Fits Wide Range of Sizes - 5/16” wide #304 stainless steel band fits hoses from 1/2” – 1” (13 - 25 mm) in diameter and can be used in many applications such as automotive, industrial, mechanical, agricultural, boat/marine, recreational vehicles, and construction. | Easy to Use - Integral plastic key and steel screw mechanism allows for one hand tightening of the clamps in confined spaces to provide a leak proof seal. | Includes five (5) hose clamps.