1 Details Paving Breaker Whirli BitChisel TipDesignated Size 7/8 Inch x 3-1/4 Inch ShankSteelUsed On Power Tool Paving BreakerHole Size 5/8 InchHole Depth 21 InchApplication Dowel Hole Drilling Specifications For Use On: E-Z Drill Dowel Pin Drill