IDEAL Industries 36-577 13" Hole Saw Arbor Extension

It's a 13 inch extension that bolts between your drill and an IDEAL bi-metal hole saw arbor, adding up to 12 inches of reach. Use it when you're boring through deep framing, stacked plates, or drilling into a bay where the drill body won't physically get close enough to the work surface.

No. Model 36-577 is the extension shaft only. You still need the IDEAL bi-metal arbor with its pilot bit, plus the cutter itself, to make a hole. Electricians stocking a van for deep boring typically carry the arbor, a range of bi-metal saws, and this extension together.

Hole saws have a fixed cut depth set by the cup, so a deeper cup gets you a deeper cut but not more clearance. An extension like the 36-577 solves a different problem: reach. It moves the drill back up to 12 inches from the cutting face so you can work inside a joist bay, a wall cavity, or behind an obstruction. If your issue is material thickness, go to a deep-cut saw; if your issue is getting the drill into position, use the extension.

It's sold as an electrical tool accessory, and that's where it earns its keep, running feeders and branch circuits through deep plates and blocking. But nothing about it is trade-specific: any job where an IDEAL bi-metal arbor needs another foot of reach, plumbing rough-in or low-voltage pulls included, is fair use.