Greenlee 712A1000 Bushings For Hole Punched By Greenlee 710, 1000-Pack 1000 Bushings for pre-punched hole or 1-11/32" (34.1 mm) diameter hole punched by 710 Metal Stud Punch Helps protect wire insulation from sharp edges of metal studs Makes pulling smooth and easy by preventing hang-ups of cable on raw metal edges