A bi-metal hole-saw kit was part of the cutting equipment I bought for the van project.
The featured Amazon option is Milwaukee 49-22-4185 Hole Saw Kit.
Where it fits my build
My Day 87 plan put the body openings ahead of the aluminum framing, flooring and wall panels. I specifically included the shower drain and the openings for three water tanks in that order of work.
I removed cargo tie-down hardware to leave mounting points for the extrusion framing, and removed door trim for the later insulation and paneling. SketchUp helped me plan how those separate jobs would fit together.
The cargo floor during my preparation session before sound deadening.Removing stuck-on residue during the floor cleanup.
My build notes
The useful part of this diary entry is the sequence. I wanted to finish the drilling while the interior metal was bare, so later work would not mean opening finished surfaces again.
The photographs show my preceding floor-preparation session. Sweeping, washing and removing residue created the starting point for the interior work I described next.
I planned the openings and mounting access before enclosing the interior.
Alternative products
Two alternatives to compare
Milwaukee and DEWALT package several hole-saw sizes together. Luckyway provides another kit format, with the included sizes defining the openings each set can cut.
DEWALT D180005 Hole Saw Kit
This DEWALT kit combines hole saws with quick-change mandrels and pilot bits. Its range of saw diameters provides several circular-opening sizes.
This Luckyway set groups circular hole saws with supporting mandrels and pilot bits. The assortment supplies several diameters for cutting round openings.