Product details:

Makita 711446-A Spline Bit Features 4-cutter technology for reduced friction and rapid dust removal Central guiding action for accurate holes Centering tip features a more aggressive design for faster hole starting Engineered for reduced vibration Wear marking on primary cutter indicates bit wear Made of the highest quality chrome-nickel-molybdenum steel For drilling holes in concrete; 11" usable length For use with Rotary Hammers that accept Spline shank bits Makita 711446-A Includes (1) 1-1/8" x 16" Spline Bit, 4-cutter