bit the cutting part of a drill; usually pointed and threaded and is replaceable in a brace or bitstock or drill press; "he looked around for the right size bit"
Verb
snaffle -
fit or restrain with a snaffle; "snaffle a horse"
snaffle -
A broad-mouthed, loose-ringed bit metal in a horse's mouth. It brings pressure to bear on the tongue and bars and corners of the mouth. Often used as a training bit.