brace head

brace head

[′brās ‚hed]
(engineering)
A cross handle attached at the top of a column of drill rods by means of which the rods and attached bit are turned after each drop in chop-and-wash operations while sinking a borehole through overburden. Also known as brace key.
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References in periodicals archive ?
Double Olympian marathon runner Steve Brace heads elite athletes who will run, cycle and swim the leek and said: "It was such an unusual thing to do and a great way to promote the beauty of Wales while raising awareness of food miles.