21Pcs M35 Cobalt Drill Bit Set（1/16″-1/2″） with 7Pcs S2 Driver Bits

Price: $49.99 - $44.99
(as of Oct 25, 2026 18:46:46 UTC – Details)

Product description

GRENPRO 21-Piece Cobalt Drill Bit Set — A metal drill bits suitable for stainless steel, aluminum alloy, iron, copper, and cast iron. Includes 21 high-speed steel (HSS-Co) drill bits: 1/16″(*2), 5/64″(*2), 3/32″(*2), 7/64″(*2), 1/8″(*2), 9/64″, 5/32″, 11/64″, 3/16″, 13/64″, 7/32″, 15/64″, 1/4″, 5/16″, 3/8″, 1/2″
Bonus 7-Piece S2 Steel Screwdriver Bits — Includes T20, T25, H5, 1/4″ hex, PH1, PH2, and SL6 tips. One set handles drilling and screw driving — no extra purchases needed
M35 Cobalt Steel — Made from M35 cobalt-based high-speed steel with a surface hardness of ≥63 HRC, offering excellent heat resistance and hardness. Drills clean, precise holes in stainless steel, aluminum, and cast iron while staying sharp longer
AlTiN Premium Coating — The aluminum-titanium nitride (AlTiN) coating withstands up to 1600℉, exceeding standard TiAlN. Stays sharper longer, cuts smoother, and significantly extends bit life under heavy-duty use
Bullet Point Tip — Unique bullet-shaped design starts holes on contact , minimizing deflection. Drills up to 3X faster than conventional bits, producing clean, burr-free holes with less effort