Diablo DHS4250 4-1/4 Inch Hole Saw is a bi-metal hole saw built for drilling large-diameter holes in wood, plastic, aluminum, metal, and stainless steel. This is a hole saw designed for multi-material hole cutting with a handheld drill or drill press. Model Number: DHS4250. For plumbers, electricians, HVAC installers, and general contractors, the big selling point here is simple: it gives you a full 4-1/4 inch hole size with a deeper 2-3/8 inch cutting depth, so you can get through more material in one pass and keep moving.

What matters on the job is not just diameter, but how cleanly and efficiently the cup works once it is loaded up. Diablo built this saw around deeper cutting capacity and faster clearing. The 60 mm, or 2-3/8 inch, cutting depth is called out specifically for deeper holes in one pass, which is a real advantage when you are working through thicker stock, layered assemblies, or materials where a shallow cup would force you to stop and finish from the other side.

This hole saw also leans hard into reducing the little slowdowns that eat up time. Tool-free plug ejection means you are not wasting minutes digging out the slug after each cut. The variable tooth design is there for a reason too: faster cuts with less vibration. That matters when you are opening larger holes overhead, drilling in awkward positions, or trying to keep a handheld drill from chattering its way across the work surface.

The construction is bi-metal, which is the right choice when the work is not limited to one material. If you move between wood, wood with nails, sheet metal, plastic, steel, fiberglass, plaster, or PVC, a multi-purpose bi-metal hole saw makes more sense than keeping separate cups for every task. This one is sized for bigger openings, so it is a good fit when the hole itself is the project, not just a pilot or pass-through.

System fit is important here. The Diablo DHS4250 4-1/4 Inch Hole Saw is designed to work with Diablo's SnapLock Plus mandrel system, and the mandrel is required. That setup is built around quicker cup changes and less downtime when you need to swap sizes. It is also intended for use with either a drill press or a handheld drill, which gives you flexibility depending on whether you are in the shop or out on a jobsite.

If you regularly cut large holes for pipe, conduit, ductwork, access openings, or rough-ins across mixed materials, this is the kind of accessory that earns its keep fast. It is not a specialty cup for one narrow use. It is a large-diameter Diablo hole saw aimed at tradespeople who need a dependable multi-purpose cutter with deeper reach, faster slug removal, and a system that keeps setup changes from slowing the day down.

Diablo DHS4250 4-1/4 Inch Hole Saw for Big Openings Without the Usual Headache

This is a smart pick if you need a large multi-purpose hole saw that cuts deeper, clears plugs faster, and works inside a quick-change system that actually helps on the job.

• Who it's for: Plumbers, electricians, HVAC crews, and remodelers cutting larger pass-through holes in mixed materials.
• Why it stands out: The 2-3/8 inch cutting depth, tool-free plug ejection, and SnapLock Plus compatibility all target the stuff that usually slows big hole saw work down.
• Worth knowing: This is the cup only. The mandrel is required and not included, so make sure your setup matches before the job starts.

• What materials can this hole saw cut? It is designed for multi-material use including wood, plastic, aluminum, metal, and stainless steel. Listed applications also include fiberglass, plaster, PVC, gypsum, and sheet metal.
• Does this hole saw include an arbor or mandrel? No. Arbor included is listed as no, and a Diablo SnapLock mandrel is required.
• Can it be used in a drill press? Yes. It is listed for use with either a drill press or a handheld drill.
• How deep can it cut? The cutting depth is 2-3/8 inches, which is intended to help bore deeper holes in one pass.