Collared screw hose clamps have a 3/8 inch safety collar and a hex head screw. This helps to eliminates the potential danger of a screwdriver slipping and damaging the hose. The combination collared and hex head screw can be used with blade type and nut drivers as well as socket wrenches. Collared screw hose clamps have a 9/16 inch band width. This offers a greater sealing area. Use them for diameters ranging from 3/8 inch to 4 inches.