Turn Key Hose Clamp ,Worm Gear TypeSAE J 1508 StandardType M 5/16" Wide Perforated BandType F 1/2" Wide Perforated BandTurn-Key ( Thumbscrew) made of plastic handle or stainless steelPopular Sizes BelowSAE 04 8mm Wide Band 1/4 to 5/8 6-16mmSAE 08 8mm Wide Band 5/16 to 7/8 8-22mm SAE 12 12.7mm Wide Band 1/2 to 1-1/4 13-32mmSAE 20 12.7mm Wide Band 3/4 to 1-3/4 19-44mmSAE 28 12.7mm Wide Band 1-1/4 to 2-1/4 32-57mmSAE 48 12.7mm Wide Band 2-3/4 to 3-3/4 72-95mmSAE 64 12.7mm Wide Band 3-1/2 to 4-1/2 89-114mm