Bosch HS1809 1 3 4 In Square 16 Tooth Bushing Tool Bit Round Hex Spline Shank Heavy Duty Concrete Masonry Stone Aggregate Scabbler Surface Texturing Spade Bits no touch accessory swaps no touch accessory swaps hand spin the extension first to ensure proper thread alignment before engaging the 72 tooth ratchet for final torquing the entire structure undergoes a proprietary heat treat hardening sequence that tempers the core while protecting the striking teeth against premature blunting or cracking when colliding with dense river rock aggregate components 25 inches Material Tool Composition Proprietary Heat Treated Alloy Steel Primary Application Scope Roughing Up Concrete