Dixon Valve & Coupling LS188 Stainless Steel 301 LS Style Quick Release Worm-Drive Clamp, 1/2" Band Width, 2-1/16" to 12-5/16" Hose Outer Diameter Range Type 301 stainless steel band helps provide resistance to corrosion, wear, and fatigue Zinc-plated carbon screw resists rust Worm gear mechanism for precise band adjustment Quick release screw swivels to lock or disengage the clamp