Worm Gear Clamps; Clamp Type: Worm Drive; Minimum Diameter: 1-13/16 (1.8125 in); Maximum Diameter: 2-3/4 (2.7500 in). Band Material: Stainless Steel. SAE Size: 36. Band Thickness: 0.22in. Drive Type: Slotted. Screw Material: Stainless Steel. Hex Size (Inch): 5/16. Series: B-Hs Stainless Steel. Material Grade: 200/300. Screw Type: Hex Head. Material: Stainless Steel. The band and housing components are made of high grade 300 series stainless steel. The 5/16" hex head screw is made from 400 series stainless (as provided in Rainforest product description). Suitable for hose, tube and fitting clamping applications; corrosion resistant construction and robust hex-head drive for reliable tightening.