12pcs Bi-Metal Hole Saw, 15-50mm Metal Hole Saw Tooth Kit Drill Bit Set Stainless Steel Alloy Wood Cutter for Mental Wood Stainless Steel Plastic Copper
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“Solid value for occasional home workshop and light commercial use, but production shops requiring durability through high-volume runs should invest in premium carbide-tipped alternatives.”
Our Review
This 12-piece bi-metal hole saw set covers the practical 15-50mm range most jobsites need. The bi-metal construction—cobalt-steel teeth bonded to a steel body—handles stainless steel and aluminum without dulling quickly, though I've seen premium brands maintain edges longer in production runs. The included arbor fits standard 3/8" drill chucks, and the stepped design minimizes wandering on metal. Cutting speed peaks around 500-1000 RPM depending on material; pushing past 1200 RPM generates excessive heat on thinner stainless. The set lacks arbor bushings and a center punch, requiring separate purchases. Depth stops would improve precision on through-holes.
What We Like
- Bi-metal teeth handle stainless steel, copper, and hardwood without significant chipping
- 12-piece range (15-50mm) covers 90% of residential and light commercial drilling tasks
- Affordable entry-level price point for contractors testing jobsite needs before investing in industrial-grade cutters
Watch Out For
- No depth-stop collars or center punches included, adding hidden costs and setup time
- Bi-metal coating can dull after 100+ holes in repeated stainless applications compared to carbide alternatives
The Verdict
“Solid value for occasional home workshop and light commercial use, but production shops requiring durability through high-volume runs should invest in premium carbide-tipped alternatives.”
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