View product detail page of 7 / 8 In. x 21 In. Spline Speed-X™ Rotary Hammer Bit. 7 / 8 In. x 21 In. Spline Speed-X™ Rotary Hammer Bit 7 / 8 In. x 21 In. Spline Speed-X™ Rotary Hammer Bit Code: HC4041