Hex Shank: 7/16" - Diameter: 1 1/16" - Twist Length: 24" - Overall Length: 29". Single spur, cutter, and side lip design bore though creosoted poles without clogging, binding, or stopping to clear chips. Extra - long twist is ideal for boring large poles, construction timbers, and for multiple timber applications. A-Aerial Service Company, IRW 47017