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Product Description Hammer Drill Bit, Shank Shape SDS Plus, Number of Cutter Heads 2, Bit Dia. 1/2 In., Drilling Length 16 In., Overall Length 18 In., Shank Size 25/64 In. From the Manufacturer Extraordinary lifetime and high drilling speed in concrete and concrete with rebars; New centric conical tip - top hole guidance, constant hole diameter; New Sharp cutting edge border - deep penetration into concrete with rebars with each hit - continuous high drill speed. New wear mark - always correct hole diameter for anchor setting.