Review on ZXHAO Grinded Sqaure Cutter Diameter by Ricky Bedell

5/8 and 3/4 are correct but my 7/8 shank diameter was 20mm. I have an R8 20mm collet? of course not! So I ended up wasting time setting it up on the lathe to get it down to 3/4". I'm giving it 2 stars because the router ended up doing a great job on the aluminum I put it on should use, but wasted hour modifying I didn't plan the end mill so be careful.