Merrill™ Duo-Loc Clamps have all 300 series high nickel stainless steel band, buckle and screw - for greated corrosion resistance. Unique design provides double-locking security and high band tension for high sealing pressures. Completely mechanical design locks the one piece housing directly to the band using the full strength of the material to provide maximum anti-shear protection. No spot welds to rupture under stress or corrosion. A one piece housing that cannot come apart under high loading.