We have been using these for a while and have tried what I think could be any other currently available. These are very very durable. Extremely adjustable and provides precise duplication. Take extra drills with you, we try to keep a 4:1 ratio so the drills are sunk. The bits are a tighter helix than most shops that make faster cuts. On average we make about 500 holes with drills and 2000 cuts with a countersink before becoming blunt or damaged. You can keep using them after 2000 cuts, but you will find them tearing at the edges. Our typical job is at IPE, which is very merciless with tools. Amazing sinker. The one with the nylon shell is good for tight spots, but not as strong as the one with the gold body.
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