Arbor Hex 3/8in W/Pilot-2nuts

I use this arbor daily. I am in commercial construction. The quick release is great. Just have 2 flaws. There isn't anything to prevent the hole saw from getting locked onto the nut. So you have to use your channel locks to get the hole saw off. Also the pilot bit won't stay locked in with out the nut for the hole saw being locked in. So after and before every use of this arbor you'll have to break the hole saw free. Just seems more time consuming when it's entire purpose is to be quick. Pilot bits do seem to stand up to the metal pipe better than any others I have used. Gave 3 stars for the idea and the strength of the pilot bit.