Review on 🔪 Improved MK Morse AV68 4 Inch Bi Metal Blades by Robert Farrar

I have several sizes of these bits and they are still sharp after years of cutting holes in wood and fiberglass boats (hulls and decks). Fiberglass, in particular, can dull a hole saw quickly, but I'm happy to report that this grade stays sharp after about 50 holes. This works for my other arbors, but I recommend the one from the hole saw supplier: http://www.amazon.com/Morse-M45P-Boxed-Arbor-AV20-AV96/dp/B000E8BFIO/ref=pd_bxgy_hi_text_y This arbor doesn't just work with these Hole saws as you would expect but also with Dewalt and Starlett holes. saws.