View product detail page of 9 / 16 In. x 21 In. Spline Speed-X™ Rotary Hammer Bit. 9 / 16 In. x 21 In. Spline Speed-X™ Rotary Hammer Bit 9 / 16 In. x 21 In. Spline Speed-X™ Rotary Hammer Bit Code: HC4516