Cobalt Drill Bit Set for Metal and Hardened Steel, 21Pcs M35 HSSTwist Jobber Metal Drill Bits 1/16"-3/8", with Index Storage Box

PROFESSIONAL & WIDELY USE: M35 Cobalt HSS is more suitable for hardened material. Particularly successful in cutting through hard metals such as stainless steel, cast iron, high temperature alloy, titanium alloy, hard plastics and woods, and also can be used for softer materials. Please note that they are not suitable for glass or ceramic materials. Pay attention to speed, pressure, and heat control when drilling. Premium Material: The material of the drill is M35 high speed steel with 5% cobalt. Compared with the ordinary high speed steel drill, the cobalt-containing drill has a longer service life and can stay sharp for a long time, which is more suitable for drilling hard materials. Perfect Drill Bits: Precision grinding process for a clean surface and high grinding accuracy. Universal round drill shank, widely applicable of tool holding systems and tightly clamped. A Must For Professionals: Whether a professional wood worker, handyman or construction worker, or you simply enjoy the occasional house project as a relaxing hobby, the 21Pcs metal drill bits set are an excellent assortment for ensuring perfect holes.

• M35 Cobalt 5% Material: High cost, but hardness is up to 67, cut faster and has a long life, up to 12 times compared with the average HSS titanium coated bit
• Hardened Full Grinding Process: Increases wear resistance, sharp and durable, used for stainless steel, cast iron, titanium, aluminum and hard metal
• Twist Design And Performance: Precise 135° split point, gold oxide finish and round straight shanks. prevent walking, clear chips and particles faster, produced by precision fully ground which ensures chips move smoothly
• Use Notices: Drill bit should be vertical to the workpiece when used, controling low speed from 200 to 1000 rpm; using cutting fluid will stay cool to make the bit last longer
• Various Sizes: 21 sets of drill bits include 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 and 3/8 inch, can meet more needs