Material : Copper Alloy Application Used for forming straight through, Tee and Cross joints. Sizes : (Light, Medium, Heavy, Rectangular, Cross) Metric: 16 x 3, 19 x 3, 25 x 3, 40 x 5, 50 x 6 Imperial : 5/8" x 1/8", 3/4" x 1/8", 1" x 1/8", 1-1/2" x 1/5", 2" x