The Diablo DHS4000 4 Inch Hole Saw is a bi-metal hole saw built for cutting large-diameter holes in wood, plastic, aluminum, metal, stainless steel, drywall, plaster, fiberglass, and other common jobsite materials. This is a hole saw designed for drilling 4 inch openings with a handheld drill or drill press. Model Number DHS4000. If you are cutting for venting, duct runs, locksets, electrical work, or general rough-in, the big advantage here is depth: Diablo gives this saw a 2-3/8 inch cutting depth so you can bore deeper holes in one pass instead of fighting a shallow cup.

That deeper cup is the main reason this saw stands out. Diablo rates it at 40% deeper cutting than standard hole saws, which is a real time-saver when you are going through layered materials like siding over sheathing, wood over insulation, or thicker assemblies where a shallow saw leaves you finishing the cut from the other side. On the job, that means fewer resets and a cleaner workflow when you need the hole done and need to move on.

The DHS4000 also uses Diablo's SnapLock Plus mandrel system. That matters if you already run multiple hole saw sizes during the same install. Instead of wasting time threading cups on and off, this system is built for quick attachment and quick changes. Diablo also calls out tool-free plug ejection, which is one of those features that sounds small until you are clearing packed plugs all day. Less time digging material out of the cup means more productive cutting.

Cut quality and control come from the bi-metal construction and Diablo's variable tooth design. In practical terms, that tooth pattern is meant to cut faster while reducing vibration. On a large 4 inch hole saw, that matters because vibration can make a saw feel rough, wander at the start, or beat up both the operator and the material. A smoother cut is especially useful when you are drilling sheet metal, plastics, or finish-side materials where control is more important than brute force.

This hole saw is sold as an individual cup, not a full kit. A Diablo Snap-Lock mandrel is required, and arbor included is listed as No. That is important before you buy. If you already own the SnapLock Plus setup, this makes sense as an add-on size. If you do not, plan on buying the mandrel separately so the saw is ready to work when it shows up.

Compatibility is broad on both the material side and the tool side. Diablo specifies use with a handheld drill or a drill press, and the cup fits the Diablo mandrel system used across Diablo hole saw sizes from 5/8 inch to 6 inch diameter. That makes the DHS4000 a logical choice for tradespeople standardizing around one hole saw platform instead of carrying mismatched arbors and cups.

Who should buy it? This is a good fit for electricians, HVAC installers, remodelers, general contractors, maintenance crews, and serious DIY users who need a true 4 inch hole saw for repeated service work or rough-in tasks. If your work regularly calls for bigger pass-throughs for ducting, venting, or access holes, the deeper cup and faster change system are the parts that justify this saw. If you only need a one-off hole and do not own the mandrel yet, just know the system buy-in before checking out.

• Does this hole saw include an arbor or mandrel? No. Arbor included: no, and the saw requires a Diablo Snap-Lock mandrel.
• What materials can it cut? Diablo lists wood, plastic, aluminum, metal, stainless steel, drywall, plaster, fiberglass, PVC, and wood with nails among the supported material applications.
• How deep can it cut? The rated cutting depth is 2-3/8 inches, which Diablo states is 40% deeper than standard hole saws for deeper one-pass cuts.
• Can I use it in a handheld drill? Yes. Diablo states it is for use with either a handheld drill or a drill press.

Diablo DHS4000 4 Inch Hole Saw Makes Sense for Guys Who Hate Shallow Cups

The whole point of this saw is simple: cut a real 4 inch hole, get through more material in one shot, and spend less time messing with plugs and cup changes.

• Who it's for: Pros and serious DIY users doing ducting, vent runs, rough-ins, and other large-hole work in mixed materials.
• Why it stands out: The 2-3/8 inch cutting depth and SnapLock Plus system are the big selling points. If you swap sizes often, those two features save more time than flashy claims ever will.
• Worth knowing: This is not a grab-and-go all-in-one purchase if you do not own the mandrel already. The hole saw is sold individually, and the required Snap-Lock mandrel is separate.