Review on 🔧 Maximize Efficiency with the Piece Left Hand Drill Double Flute: An essential tool for precise drilling by Sean Sheppard

I got these because I had to remove broken screws. The screws were hardened and the surrounding metal was cast iron. I had to completely drill through the hardened screws. These bits really stood the test, only one lost part of the edge. This performance exceeded my expectations for bits in this price range. If you need left hand bits (and everyone should have a set at the store), get them.