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Originally Posted by danquirk

Attachment 41432I received a drill bit kit - many assorted sizes and types with a few extras like a hole saw and some grinding wheels but basically a drill bit kit. In it are 2 - exactly the same - grey things that look like Marr connectors but aren't. They are about that size but (a) have a hole at each end - roughly 7/16" and 3/8" and (b) have a springy thing inside with 6 "teeth". Thought they might be drill bit stops but no, and they are not adjustable

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