9/16 inch band width offers greater sealing area. 5/16 inch slotted hex head screw. 300 series stainless steel band, housing and screw. Heavy duty, four-piece construction. Two-piece, mechanical interlock housing. Precision Brand Heavy Duty 4-Piece Hose Clamps allow 80 inch pounds of torque. They have a wide range of applications including marine, plumbing, agricultural and heavy duty industrial.