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Linrui Tools CO21

Hss Cobalt Drill Bits Set 21PCS Triangle Shank,Industry Drill bits with Golden Ratio Tip,

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Detailed Description:

Set of 21 HSS cobalt drill bits with triangle shanks, designed for industrial use. Features a golden ratio tip for precise drilling.

SPECIFICATIONS:21PCS COBALT DRILL BIT SET： 1/16,5/64,3/32,7/64,1/8,9/64,5/32,11/64,3/16,13/64,7/32,15/64,1/4,17/64,9/32,19/64,5/16,21/64,11/32,32/64,3/8.Sizes from 1/8 to 3/8 with triangle shank.
GOLDEN RATIO TIP:From size 5/32" with patented "Golden Ratio" Tip,which especially designed for heavy duty purpose, effect clean&smooth holes on hard metal like stainless steel,and moreover, at least 3 times longer life.
COBALT 5% MATERIAL:suitable for stainless steel or any hard metal,significantly increases the ware-resistance and durability.
STORAGE BOX:strong metal box.
HOW TO USE:controlling the drilling speed by lowest RPM would make drill life much longer than 3 times.