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Product Description Spline Drive Hammer Steel, Tamper Plate, 3/4 In Hex With 21/32 Round Steel Shank Type, Length 5 In, Blade Width 5 In, For Use With Spline Drive Demolition And Rotary Hammers, Application For Compacting Soil And Gravel Amazon.com Bosch brings constant innovation to concrete and masonry drilling. From inventing the industry standard SDS system to custom-manufactured carbide and diffusion bonding, the result is better performance and durability. And Bosch Xtreme bits last 4-times longer than any other bit when hitting rebar.