expansive bit(n = noun.artifact) expansion bit - a bit with a cutting blade that can be adjusted to different sizes;
is a kind of bit

a bit, bar bit, bit, bit by bit, bit field, bit part, blade bit, bore bit, brace and bit, canon bit, center bit, centre bit, chamfer bit, check bit, core bit, countersink bit, cross bit, curb bit, drill bit, drilling bit, every bit, expansion bit, expansive, fippenny bit, fishtail bit, not a bit, parity bit, pilot bit, rock bit, roller bit, snaffle bit, spade bit, the least bit, twist bit