fishtail bit(n = noun.artifact) blade bit - a drilling bit with cutting edges usually hardened against wear;
is a kind of drill bit, drilling 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 bit, fippenny bit, fishtail, fishtail palm, not a bit, parity bit, pilot bit, rock bit, roller bit, snaffle bit, spade bit, the least bit, twist bit