Drill America 21 Piece Cobalt Jobber Drill Bit Set

21-Piece Cobalt Jobber Set

This 21-piece cobalt steel jobber drill bit set covers fractional sizes from 1/16 inch to 3/8 inch in 64th increments. The gold oxide finish resists wear and reduces friction during drilling. A 135-degree split point ensures accurate starts without a centre punch. Supplied in a metal case for organised storage.

Round Shank Fits Standard Chucks

The round shank design fits any standard three-jaw drill chuck without adapters. Cobalt steel handles high-heat drilling in stainless steel, cast iron and titanium alloys. Jobber length provides the reach for general-purpose hole making. The set frees you from buying individual bits for common fractional sizes.

Upgrades From High-Speed Steel Sets

Replaces general-purpose high-speed steel sets when drilling hard metals that dull standard bits quickly. The cobalt alloy retains hardness at higher temperatures, extending bit life in tough materials. The jump is worth it for workshops that regularly drill stainless steel or other abrasive alloys. Not for buyers who only drill wood, plastic or soft aluminium.