View product detail page of 1-1 / 4 In. x 21 In. Spline Speed-X™ Rotary Hammer Bit. 1-1 / 4 In. x 21 In. Spline Speed-X™ Rotary Hammer Bit 1-1 / 4 In. x 21 In. Spline Speed-X™ Rotary Hammer Bit Code: HC4071