18" Bull Point 3/4" Hex x 21/32" Round Spline Shank (Package of 15) The DeWalt 18" bull point 3/4" hex x 21/32" round spline shank is an extremely durable and useful attachment. Use this to increase your efficiency and decrease your work time. Superior build quality means you will be using this bit for years with minimal wear and tear. A must have for any professional or do-it-yourselfer. Features: Fully hardened steel body delivers increased life and durability. Bulk packs of 10 or 15 available for the most common products. Specifications: Front Handle Style: DEWALT is firmly committed to being the best in the business, and this commitment to being number one extends to everything they do, from product design and engineering to manufacturing and service.