I had to cut 4 1/4" holes in several false ceiling tiles. No fuss - no hassle. (I didn't even need a screwdriver - I just twisted it by hand.) One more note: This unit requires a cartridge 1/2 inch.
Pros
>This 4-1/4 hole hole saw blade is designed for drilling holes in sheet metal, drywall, plastic pipe, wood, PVC and fiberboard.