Para sacar pernos y tornillos quebrados o atascados, #1, 3 mm-6mm (1/8"-15/64");#2, 6mm-8 mm (15/64" - 5/16"), #3, 8mm-11mm (5/16"-7/16"), #4, 11 mm-14mm (7/16"-9/16"), #5 14 mm-20 mm (9/16"-3/4")