Sioux Chief 550-20 series, Touch Down II universal pipe clamp is to be used where necessary to insulate or secure any pipe, conduit or wire ranging from 1/2 inch CTS to 2 inch IPS in residential or commercial applications. Variable clamping tension allows for thermal expansion and contraction. Provides 5/8 inch stand off from building member. Clamps shall be certified by UPC/IAPMO.