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The DiversiTech B-20H Hose Clamps, No. 20, 13/16 in. - 1-3/4 in. diameter, 3/4 in. - 1 in. hose I.D, partial stainless, worm drive, adjustable. 300 series stainless steel 1/2 in. band with plated 5/16 in. slotted hex head screw and housing, except the B-4H which has a 5/16 in. band and 1/4 in. nut. Recommended for most applications. 100 Percent interlock construction features one-piece housing which directly locks into band.