Description of πͺ Spyder Rapid Eject 600105 4.5-Inch
New Rapid Core eject holes saws allow you drop out the core at the touch of a button. Made with tough bi-metal steel. Variable tooth pitch guarantees a fast and clean cut through all thicknesses. Cutting depth of up to 1-7/8".
I received this item 3/6 - planned to cut holes for (2) 4" recessed lights. Did this on the first hole and noticed the teeth just don't cut very well. I used this on cypress (a type of softwood) and couldn't get the hole completely done. Returned as defective. Your mileage may vary (YMMV).
The Spyder 4 1/2" hole saw is as good as anything I've ever used, it's sharp, well built and precise. As is any tool use them properly. NEVER TRY TO USE A LARGE BOX IN METAL WITH A HAND TOOL! You will hurt yourself. I cut in 1/4" aluminum, went like clockwork.
Pros
Variable tooth spacing provides fast, clean cuts of any thickness
GREAT hole saw for the price If you're the type of person who wants to add 120mm fans to various projects then you need this hole saw. While not 120mm, anything available in the US other than 120mm isn't that good for the price (and a slightly smaller size looks better - then the fan will cover all areas of the cutout). I did a clean job on my steel computer case to add a top fan (see photo - intentionally misaligned due to motherboard/case) and did a great job with the case my computer fitsβ¦