PRO GRABIT" BROKEN BOLT & DAMAGED SCREW EXTRACTOR KIT *3 piece kit *Removes screws: No. 4-14, bolts: No. 10-5/16" (5mm-8mm) *Self-centering drill tip - no walking or wondering *Drills up to Grade 8 and 10.9 class bolts *Use in reverse only with 3/8 inch variable speed reversible drill *Extract screws up to 4 inch long from wood, plastic or metal *Compatible with quick connect chuck systems