1/2" Stainless Steel Two Hole Clamp Fittings These clamps are a little loose for 1/2" copper pipe or similar, but are tight when used on 1/2" steel pipe. They are flimsy @ 0.0019" (1/500"), good quality stainless steel and can be cut with metal shears. You can use two or three (thick) heavy duty. I tested the clip on a damp cloth for a week fastened and no rust has occurred.You can use a sheet metal punch to punch new holes (with some force) if you want to make smaller clips, for example.Clamps, wrapped a short piece of tape around the center, made a new hole in the cut end and used them as terminals for the 10/3 flat electrical wire. 3.