American Valve 6-Pack Worm Gear Hose Clamp, 2-1/16" to 3" (SAE size 40), CL40PK6, 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 2-1/16-in up to 3-in The recommended installation screw torque is 30-40 lbs/in (3.4 - 4.5 Nm)