- a drilling bit with a central projecting point and two side cutters
Examples from the Web for centre bit
A centre-bit was fitted into a stock, and a hole cut right through.The Dark House
Georg Manville Fenn
It is a steel-cutter, and can be made any size by moving the centre-bit.
No, no; you just put the centre-bit in your coat-pocket for a precaution, and leave the rest to me.General Bounce
G. J. Whyte-Melville
His conduct is meaner than the conduct of the most ruffianly burglar that ever worked a centre-bit.
A natural aptitude drove him from the fiddle to the centre-bit.