Square Die Cast Alloy Bosshead allows up to 15mm Rods.Two wide pad metal screws make it easier to securely fasten the Boss Head to the support apparatus and clamp.Threaded metal one piece clamping screwsAble to hold rods up to 15mm in diameterHolds rods orthogonal (90 degrees) to one anotherAll-metal construction to carry heavy loads and prevent torque damageMade from high grade metal alloy finished with non toxic powder coating. Non-ferrous rust free & long lasting use for any laboratory application