This drip edge goes under the shingles not on top of them, you will have to slide it in under the first row of shingles. Mike
I use a staple gun with 5/8 staples.
I ordered mine online & picked it up at the store.
Thanks for your inquiry. Our steel is sourced from various mills and though all have some recycled properties we have no way of giving a % for a specific product.
I used some metal snips to cut mine.