Diablo Rebar Demon SDS Max 4 Cutter Carbide Tipped Hammer Drill Bit 2" Diameter, 21" Length, 16" Working Length DMAMX1400 Engine & Oil Fluid Additives hard stamped size markings hard stamped size markings 2 mode operation for "Hammering Only" or "Hammering with Rotation" for multiple applications Most Durable Diablo made Dura Carbide features up to 2X more carbide that withstands up to 1800°F of intense heat to combat rebar hits versus standard bits that fail at 800°F Superior Performance Optimized for maximum performance in corded and cordless SDS Plus or SDS Max rotary hammers and wear mark indicator ensures precise hole making