Presented for sale is a 3 3/4\" hole saw WITH MANDREL and a home made wrench used to install 1 AIRMAR B175. Wrench is sized to grip the big transducer nut, and worked great. The hole saw and mandrel would cost you 40 bucks or so to buy. I just used this saw and made the wrench to install mine and will probably never use them again. Hole saw is sharp as new, and went through my fiberglass hull in less than 30 seconds. I will charge a flat 10 bucks for shipping, and will only ship to the lower 48. Thanks for looking!

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