Greenlee 12-04-54A Specifications: Bit Diameter: 3/4" Shaft Length: 54" (1828.8 mm) Shaft Diameter: 3/16" (4.8 mm) Greenlee 12-04-54A Features: For aggressive chip removal in many types of woods. Screw point for easy starting and pulling through wood. With screw point removed, this bit can be ground to function like a standard combination bit. Proven in the field to deliver accurate and professional results in many applications. Bits range from 3/16" to 1" (4.8 to 25.4 mm) in diameter and in shaft length from 12" to 72" (304.8 to 1828.8 mm). The D'VersiBIT System makes it possible to easily accomplish even complex installations. This patented system attaches a quality drill bit to a long flexible spring steel shaft. When used with the Placement Tool, this flexibility makes it possible to easily manipulate the bit within walls. After drilling, attach a D'VersiGRIP to the hole in the drill and pull wire or cable back through the wall.