The Forney 60239 20 Piece Mini Drill Bit Set is used for precision drilling of wood, plastic and metal. Convenient steel index storage case. Forney Industries is one of America"s longest operating family-owned metal working product companies. Founded in 1932, Forney offers more than 5,000 products for the hardware, automotive, farm and ranch and do-it-yourself markets. 20-Piece, sizes 61-80. 30,000 Max RPM. Claims for warranty must be made within 90 days of the date of purchase. Proof of purchase required. This warranty does not cover any product that has been subject to misuse, neglect, negligence or accident, or that has been used in any way contrary to the purpose intended.