5pcs HSS High Speed Steel Cobalt Titanium Step Cone Drill Bits Multiple Hole 50 Sizes Product Features 5pcs Step Cone Drill Bits in 50 Sizes: It's can work as 50pcs twist drill bits. Convenience, Step Cone Drill Bits allows to cut several holes with one drill easily without changing bit constantly. High Speed Steel: Step Cone Drill Bits Made of super strong HSS steel for added durability and bit life. Double Cutting Blades and Three-sided Shank: Five standard HSS Step Cone Drill Bits with a two-flute design for faster, and 3-sided shank design prevents drill bits from slipping, smoother cutting. Widely Application: The Step Cone Drill Bits can be used to chamfer, bur, and drill or enlarge holes. The Step Cone Drill Bits can work with stainless steel sheet, aluminum alloy, plastic material and wood. (the board must be smaller in thickness than the height of Step Cone Drill Bits) Product Specification: Type: Step Cone Drill Bits Step Cone Drill Bits Material: H.S.S. 4241 Step Cone Drill Bits Length: 57~77mm/2.25~3.03in Step Cone Drill Bits Color: As the picture shows Step Cone Drill Bits 1 (6 steps): 3/16" to 1/2" (3/16', 1/4', 5/16", 3/8', 7/16', 1/2'). Step Cone Drill Bits 2 (9 steps) : 1/4" to 3/4' (1/4', 5/16", 3/8", 7/16", 1/2", 9/16", 5/8", 11/16", 3/4"). Step Cone Drill Bits 3 (10 steps) : 1/4" to 1-3/8" (1/4', 3/8", 1/2", 5/8", 3/4", 7/8", 1", 1-1/8", 1-1/4", 1-3/8"). Step Cone Drill Bits 4 (12 steps) : 3/16" to 7/8" (1/4', 5/16", 3/8", 7/16", 1/2", 9/16", 5/8", 11/16", 3/4", 13/16", 7/8"). Step Cone Drill Bits 5 (13 steps): 1/8" to 1/2" (1/8", 5/32", 3/16', 7/32", 1/4', 9/32", 5/16", 11/32", 3/8', 13/32", 7/16', 15/32", 1/2'). Package Includes: 5 x Step Cone Drill Bits Before you place an order, please provide me with English information to facilitate our delivery and logistics