American Valve 2-Pack Worm Gear Hose Clamp, 1/4" to 5/8" (SAE size 4), CL4PK2, Stainless Steel Band & Housing The band and housing are stainless steel and the screws are zinc plated carbon steel with 5/16" Hex Heads. Simple screw tightening method creates a strong clamp force that will not shake loose Good for many applications such as bundling or sealing air and fluid hose lines Adjusts from 1/4-in up to 5/8-in The recommended installation screw torque is 30-40 lbs/in (3.4 - 4.5 Nm)