Diablo DHS3250 3-1/4 Inch Hole Saw is a bi-metal hole saw built for cutting large-diameter holes in wood, plastic, aluminum, metal, and stainless steel. This is a hole saw designed for multi-material hole drilling with a drill and compatible mandrel system. Model Number: DHS3250. If you need a 3-1/4 inch opening and want more usable depth than a standard hole saw, this one is aimed at that job.

The big spec that matters here is the 2-3/8 inch cutting depth. Diablo rates that as 40% deeper cutting, which is the kind of number that actually means something on the job because it helps you get through thicker material in one pass instead of backing out, clearing chips, and finishing from the other side. For installers, remodelers, and general contractors, that translates to less wasted motion when boring larger holes for vents, pass-throughs, and rough-ins.

This hole saw uses a bi-metal cutting edge, which makes sense for a multi-purpose accessory that has to cross over between wood and metal work. It is not just for one material type. The listed applications include wood, wood with nails, steel, duct and sheet metal, aluminum, fiberglass, gypsum, plaster, and PVC. That broad application range makes it a practical choice when the material stack is not perfectly clean or when you move between trades and do not want to carry separate specialty saws for every cut.

Diablo also built this around its Snap-Lock Plus mandrel system. That matters if you switch hole saw sizes during the day, because the system is made for quick attachment and easier changeover with less downtime. The product also features tool-free plug ejection, which is one of those details that sounds small until you are clearing slug after slug on repetitive cuts. Faster plug removal keeps the work moving and cuts down on the usual hassle that comes with larger hole saws.

Another practical detail is the variable tooth design. Diablo states that it provides faster cuts with less vibration. In real use, less vibration helps the cut feel more stable, especially when you are starting a larger diameter hole or working through tougher material where chatter can beat up both the accessory and the operator. For a 3-1/4 inch hole saw, smoother engagement is a real advantage because larger saws can get grabby fast if the setup is not working with you.

Compatibility is straightforward but important: a Diablo Snap-Lock mandrel is required, and the listed minimum chuck size required is 3/8 inch. If you are already on the Diablo hole saw platform, this DHS3250 fits right into that system, and the mandrel is designed to work across Diablo hole saws from 5/8 inch to 6 inch diameter. That makes the system more useful if you run multiple sizes instead of buying a one-off accessory for a single job.

Who should buy it? This size is a good fit for pros and serious DIY users doing electrical, HVAC, remodeling, general construction, maintenance, and lock or access-related drilling where a 3-1/4 inch hole is the target. If your work calls for larger clean openings in mixed materials and you want deeper cutting capacity plus a quicker mandrel interface, this is the kind of hole saw worth looking at. Just know that it is sold as an individual hole saw and the arbor is not included, so it makes the most sense for users who already have or plan to use the Diablo mandrel system.

A smarter pick when depth and changeover time matter

The Diablo DHS3250 3-1/4 Inch Hole Saw makes the most sense for guys who are already using, or should be using, a dedicated hole saw system instead of piecing together random arbors and cups.

• Who it's for: Contractors, installers, and serious DIY users drilling larger holes in mixed materials like wood, PVC, sheet metal, and light steel.
• Why it stands out: The 2-3/8 inch cutting depth, quick Snap-Lock Plus compatibility, and tool-free plug ejection all solve real jobsite annoyances.
• Worth knowing: This is not a grab-and-go all-in-one purchase. The arbor is not included, so plan on the required mandrel if you are not already in the Diablo system.

• What materials can this hole saw cut? It is listed for wood, wood with nails, plastic, aluminum, duct and sheet metal, steel, stainless steel, fiberglass, gypsum, plaster, and PVC.
• How deep can it cut? The listed cutting depth is 2-3/8 inches, or 60 mm.
• Does it require a special mandrel? Yes. A Diablo Snap-Lock mandrel is required for use.
• What size drill chuck is needed? The minimum chuck size required is 3/8 inch.