Product Description SDS Max Core Bit With Shank, Size 2 5/8 In, Drilling Length 7 In, Maximum Core Size 2 5/8 In Depth, Overall Length 12 In, For Use With SDS Max Rotary Hammer Drills From the Manufacturer The Bosch HC8521 SDS-max core cutter measures 2-5/8-inches in diameter. The useable length is 7-inches and the overall length is 12-inches. Bosch core bits go beyond the range of standard bits and allow smaller hammers to drill larger holes. Bosch SDS-max rotary hammer core bits are carbide tipped with an integral shank for better power transmission. The maximum core size is 4 deep. The Robert Bosch Tool Corporation is one of the largest power tool and accessory manufacturers in the world. Bosch provides a complete line of corded and cordless power tools and accessories engineered to survive any jobsite and allow professionals to take control of their work. Wave design transfers energy to bit more effectively for up to 40 percent faster drilling versus previous design. Shank Diameter- 3/4 inches.