A worm drive hose clamp consists of a captive screw, housing, band and underlap. When the screw is turned, it acts as a worm drive pulling the threads of the band, causing the band to tighten around the hose. From our assortment, you can buy stainless steel clamps as well as steel clamps. You can buy clamps of width 12 mm and 9 mm in diameter from here. W1-type galvanised hose clamps suitable for non-corrosion environments and W2 clamps suitable for corrosion sensitive environments can be also purchased from here.