Description
13 32 Cobalt Heavy Duty Jobber Drill Bit (6) Round Split Drive Anchors Zinc Plated 6 20 x 1 5 8 Phillips 6 20 x 1 5 8 Phillips Drywall Self Drill Screw Zinc Plated (5000) Screws with a diameter over 1 ½ inches have a hardness rating of HRB 95 HRC 35