StarrettHole Saw Arbor - HSS Bi-Metal Holesaws A19 Arbor Compatible With A1, A2 or A10 Blister Pack - Arbor Screw with Steel Pilot Drill 4.7mm Hole Enlargement

Should have purchased this a few years back. Makes enlarging an existing hole really easy. Puchased on a whim and used quite a few times already !

Good quality

Expanding the size of the hole or making two hole discs easier

Used with two hole saws to perfectly enlarge over 50 - great job saved so much time.

Arrived promptly. Very useful piece of kit to attach my my hole cutter. 5 stars.

Oops arbor is a great bit of kit.Nice easy way to enlarge the 20 mm knockouts in electrical back boxes to accommodate 25 mm pipe.Also refurbished a hospital clinic that was using old trunking runs. But cable sizes had been upgraded, so old 20 mm conduits ripped out and needed new 25 mm conduits installed. The oops meant the holes in trunking could enlarged easier as compared with a stepped cone cutter.

Done what it promised but not a very sophisticated solution

If you have hole saws already these are a great way to remove enough wood around a broken headed screw to get pliers in to twist it out. If you just use it by itself though the saw will wander all over the surface, so you need a guide piece of wood with a hole the same size as your chosen hole saw. There's a video by See Jane Drill on YouTube that explains it.

This copilot for the hole saw is great, I am en electrician and it’s an ease to en-larger your ceiling light holes. Wow, it’s awesome.

Fast, item work as expected, really nice

Ottimo e comodo.

etwas scharfkantiges Gewinde

This works amazingly. Not used often but perfect when needed. I changed recessed lights that were 5" and went to 6", this worked excellent