SDS-Max, 7/8" x 16" x 21", Shank Bit, 16" Useable Length & 21" Overall Length, Stay Sharper Longer & Deliver More Holes, Used In All SDS-Max Rotary Hammers & All Competitors Hammers Using TE-Y & TE-FY Shanks, Manufactured To Meet ANSI Standards, Also Meet & Exceed ISO Standards, Wild Bore Head.