SPEEDWELL Square tape / Junction Clamps are used for crossing over tapes or or for T joints or for making straight through Joints in a network of Tapes. These camps can be fastened to the building by recommended csk woodscrew 1 1/2" x No 10 plugs. Materials: Body - Gunmetal Screws - Naval Brass Torch: BS EN 50164-1:2000 (5Nm)