For drilling large diameter holes in concrete, stone and masonry. Suitable for use in large rotary hammers with the SDS Max tool holder system. Narrow angle 4-cutter head greatly reduces jamming and provides smooth drilling Shot peened for extra strength and durability High quality Tungsten Carbide tip" Drill Dia. mm: 12.0 Total Length mm: 540 Working Length mm: 395 Shank Dia. mm: 18.0 Shank Type: SDS Max Drill Tip: Narrow Angle 4-cutter Material: N/A Timco SDS Max Hammer Bit (Size 12 x 540 - 1 Each) in Grey