If you’ve spent any time drilling clean pass-throughs for conduit, pipe, or fasteners, you already know a cheap cutter won’t last long. The Lenox 30010-10L Bi-Metal Hole Saw is built for exactly that kind of daily trade work — a compact 5/8-inch cutting diameter paired with a hardened bi-metal edge that’s meant to chew through metal, wood, plastics, and mixed materials without complaining. Here’s the thing — this isn’t some homeowner-grade cup saw. It’s the kind of piece you keep in the drill case because you trust it to finish the job.

What really stands out is the SPEED SLOT design and the upgraded T3 tooth geometry. In practice, that staircase slot makes plug removal way less of a wrestling match, and the tooth pattern bites fast so you’re not burning time or cooking the teeth. And that matters a lot on a job site where you might be cutting dozens of holes back-to-back. Less heat, faster entry, cleaner cut — simple stuff, but it makes the day go smoother. These Lenox bi-metal models are also known to cut faster and last longer than older designs when working in metal applications.

Key Features:

• Bi-Metal Construction - Combines flexibility with hardened cutting teeth so it holds up when drilling through metal or nail-embedded wood.
• SPEED SLOT Plug Removal - Staircase slot lets you pop out cores quickly instead of digging them out with a screwdriver.
• T3 Tooth Design - Optimized tooth pattern helps the saw bite faster and cut more efficiently through tough materials.
• - Suitable for ferrous metal, non-ferrous metal, wood, drywall, plastics, and composites on the same job.
• Trade-Ready Size - The 5/8-inch diameter is ideal for tight clearance holes used by electricians, plumbers, and installers.

Applications

This size really shines in precision trade work. Think electrical panel knockouts, pilot pipe penetrations, mounting hardware, or small service routing where you need a clean metal hole without oversizing. But it’s not limited to sheet steel — it’ll also handle wood studs, plastic panels, plasterboard, and composite materials without needing a tool change, which is exactly why multi-trade crews keep these in rotation. The bottom line is it’s a small cutter meant for real install work, not decorative DIY drilling.

Why Choose This Model

Some hole saws feel fine for the first few cuts… then they dull, chatter, or strip teeth. The Lenox professional bi-metal series is designed to resist tooth loss and stay sharp longer thanks to its high-speed steel cutting edge and reinforced backing. That means fewer replacements and more consistent holes across a full day’s workload. And honestly — when you’re halfway up a ladder or squeezed into a plant room, reliability beats saving a few coins on cheaper cutters every time.

Technical Specifications Explained

• Cutting Diameter: 5/8 in (16 mm) - Gives you a tight, controlled hole size commonly required for small conduit or fastener clearance.
• Material: Bi-Metal with HSS Teeth - Provides the toughness for metal cutting while keeping enough flex to avoid cracking under load.
• Speed Slot Design - Built-in side slot allows fast core ejection so you spend less time clearing jams mid-job.
• Multi-Material Capability - Engineered to cut metals, wood, drywall, plastics, and composites with the same saw.
• Standard Arbor Compatibility - Works with common Lenox arbor sizes so it drops straight into most professional setups.

Who Should Buy This

If your day involves installations, retrofits, or service drilling, this one makes sense. The electrician running conduit, the plumber drilling mounting holes, or the maintenance tech doing repeated panel work will all get real value here. It’s especially handy when you need consistent small-diameter holes in mixed materials and don’t want to baby the cutter.

But if you only drill a couple holes a year, sure — you could go cheaper. For anyone doing regular site work though, this is exactly the kind of dependable, no-drama trade-grade hole saw that earns its place in the kit and stays there.