5 Pack Titanium HSS Step Drill Bit Step Drill Bit Step Drill Bit for Metal Wood Multiple Hole Drilling Cone

Description: --5PCS High speed steel HSS high hardness step drill bit metric cone drill bit set. --Titanium coated to reduce friction and heat. --No need to use center punch not easy to break compared with ordinary twist drill. --Automatically deburrs chamfer open hole expansion make a clean hole as you drill. --Use tools: drill bench drill. --The recommended drilling speed is 250-400 rpm. --Suit for cutting holes in a variety of materials including thin metals steel aluminium copper wood fiberglass brass and etc.. Specification: Material: High-speed Steel Drill size: (3/16，1/4，5/16，3/8，7/16，1/2) (1/8 5/32.7/32.1/4 9/32 5/16 11/32 3/8 13/32 7/16 15/32 1/2mm) (1/4 5/16 3/8 7/16 1/2 9/16 5/8 11/16 3/4) (3/16，1/4，5/16，3/8，7/16，1/2，9/16，5/8，11/16，3/4，13/16，7/8) (1/4，3/8，1/2，5/8，3/4，7/8，1，1-1/8，1-1/4，1-3/8) Package Includes: 5 Pieces /Set Step Drill Bit