Partial stainless, worm drive, adjustable. 300 series stainless steel 1/2in. band with plated 5/16in. slotted hex head screw and housing, except the B-4H which has a 5/16in. band and 1/4in. nut. Recommended for most applications. 100% interlock construction features one-piece housing which directly locks into band. Spot weld free design.