Swordfish 32490 - 40pcs Rubber Insulated Stainless Steel Hose Clamp Assortment, 1/4" to 5/8" 
High Quality Rubber Insulated Stainless Steel Hose Clamps
Stainless Steel Material: 304
Heavy Duty Hose Clamp Assortment total to 1lb weight
Each clamp has some thicker metal around the holes as a reinforcement, and This reinforcement can be drilled and removed if you need to use larger size bolts
Mounting Hole Diameter: 1/4" (6mm) to accept 6mm Bolts.
Widely used in Automotive, Boat/Marine, Machine and Home.