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Product Specification Package quantity: 3 Pcs No.1 -- Six step bit:3/16", 1/4", 5/16", 3/8", 7/16", 1/2" drilling diameter, up to 3/8" depth of each step No.2 -- Nine step bit: 1/4", 5/16", 3/8", 7/16", 1/2", 9/16", 5/8", 11/16", 3/4" drilling diameter, up to 3/16" depth of each step No.3 -- Thirteen step bit: 1/8", 5/32", 3/16", 7/32", 1/4", 9/32", 5/16", 11/32", 3/8", 13/32", 7/32", 1/4", 9/32", 5/16", 11/32", 3/8", 13/32", 7/16", 15/32", 1/2"drilling diameter, up to 1/8" depth of each step Material:High Speed Steel Shank :1/4" Hexagonal (6.35 mm) Surface treatment: titanium coated Tools: Power drill, driver and press drill Package: 3 drill bits are packed in a blue durable storage bag that is easy to store and carry User Instruction 1) Start drilling at low speed. Do not push too much. Let the drill bit to cut by itself. The harder the material it is working with, the lower speed shall be applied. 2) Inject coolant oil while working, it will dramatically increase the drilling efficiency and extend the drill bit life time 3) Drill bits are good for wood, plastic, steel and sheet metal drilling. Stainless steel is not recommended.