Chucked into an electric drill, a spade bit will let you make large-diameter holes in wood (but not as large as holes you can make with a hole-saw bit). Spade bits make holes from 1/2 inch to 1 1/4 inches in diameter. Home Improvement Encyclopedia
a bit used in electric and cordless drills and drill presses for fast drilling of holes in wood. Spade bits have a forged, flat paddle with a point and cutting edges on one end and fit into 1/4"; and larger drills on the other end.
Wood boring bit which is used with a power drill to shave wood in a circular section equal in diameter to the width of the head of the bit. The flat head, whose edges are ground to a beveled edge, has a point used to center the bit in the wood. The turning shank forces the point into the wood.