Large and Deep Thru Hole Drill Bit, Straight, 1/4 in, 5/16 in, 3/8 in, 1/2 in Drill Bit Size, 4 in Overall Length, Bright (Uncoated), Maximum Drilling Depth 4 in, Shank Diameter 1/4 in, 5/16 in, 3/8 in, 1/2 in