... steel made 3, One set drill bit can use at least 3 months. Cross Drill Bit Tools1, Factory supply drill bit2, Best ... steel made 3, One set drill bit can use at least 3 months.4, Package: Standard package ... , 36mm, 38mm, 40mm, 42mm, 46mm, 50mm, 55mm, 60mm65mm, 70mmCross Drill Bit Picture: