Heavy Duty Bronze “C” Type Flat Jaw ClampFeatures & Benefits:● The Heavy Duty Bronze “C” Type Flat Jaw Clamp with antiblow off keeper is made to fit structural angles, flats, and copper or copperweld stranded grounding assemblies. To install, first use an abrasive cloth or wire brush to clean the surface to be clamped. Then, wipe the surface clean, position the clamp, finger tighten and set the screws. Use a wrench to secure and tighten. A 2667 clamp with contact stud offers greater versatility.● 2567 Now Grade 5H!● Main Line Range: Angles & Flate: 2.5'-4' WX ( 64-101 x 3-19mm ) Rounds:.25”-.75” ( 6-19mm ) Dia.