Features: -Cobalt drill bits are made of steel alloy with certain percent cobalt. -The cobalt increases the strength of the steel and makes it more heat-resistant. -This is an important factor in drilling hard materials because the friction of metal against metal can produce high temperatures that damage the material or the drill bit. Specification: Material: HSS, titanium coating Shank Type: Straight shank Angle Point: 135 Degree Packaged List: 10 x Twist Drill Bit
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