Alfa Tools TCBH74519 1/2 x 30 x 3/8 Shank Carbide Tipped Bell Hanger Bit Bell Hanger-Feeler Bits with Fish Hole 1/2-inch Drill, 3/8-inch Shank, 20-inch Flute Length, 30-inch Overall Length Fish eye hole near tip of flutes aids in pulling wire after drilling Designed for application in masonry and wood Quantity - 1 per Pack