I have received a Monster&Master Retro Tap Set, Metric Countersink Drill Set, 6pc, MM-CT-001. I gave this set to my husband and he loved it. He drilled a few holes in the aluminum and a few in the steel. (Not for use on hardened metals.) When drilling in metals, he recommends NOT using a power drill as you may not stop in time and break bits. It's best to use a hand drill, and when you get to the faucet, use a single-headed wrench or ratchet! Thread carefully! They seem to hold up pretty wellβ¦