Authentic Chicago Latrobe 21 pc. High-Speed Steel Jobber Length Drill Bit Set Sizes: 1/16, 5/64, 3/32, 7/64, 1/8, 9/64, 5/32, 11/64, 3/16, 13/64, 7/32, 15/64, 1/4, 17/64, 9/32, 19/64, 5/16, 21/64, 11/32, 23/64 & 3/8 Comes with metal case For wood and metal application High-speed steel provides hardness for wear resistance Black oxide finish reduces wear while promoting chip and coolant flow on ferrous materials Extra thick web for increased strength and rigidity compared to standard drill bits Made in the U.S.A.