Mikalor Supra heavy duty clamps offer several advantages over traditional T-bolt clamps. They are available across a wide range of sizes and are becoming popular in the automotive, marine, and agricultural industries as well as with various industrial OEMs plus of course the pressure washing and softwashing industry. Their special bolts are designed to withstand great tensions and permit them to be tightened with power tools and regular sockets (within manufacturer's torque settings). The thick band has beveled edges to prevent possible damage to the cover of the hose and an automated protuberance welding system is used to weld three spots on each side of the clamp. The N75 are a type 430 stainless band with a zinc plated steel bolt and the N77 are completely type 304 stainless steel. Exceeding torque ratings will bend bolt and warp housing; do not assemble with an air tool. It is good practice to check for tightness at regular intervals while in service. As a general guide with most bolt-style clamps, use 1 clamp per hose end for sizes up to 1-1/2", 2 clamps for 2"-4", 3 clamps for 5"-6", and 4 clamps for larger sizes.