I will say that I grew up in a machine shop. My Dad was a Machinist in that shop for over 40 years. It's in his blood so much so that he bought one of the lathes and hired a crane to put it in his garage. And also has an xyz Mill. So he's still machining. The Deap Blue Yatch shaft I ordered was perfect. FLAWLESS. Keys, keyways, taper, threading... Spot on. Nice job. We received it pretty darn quick as well. Oh and pricing was even better. Pay for the fit and facing service if you're away from your home and your personal machine shop, it's worth every penny. I didn't. I fought that new split coupling and shaft for several hours, finally located a local Machinist and got it done. Great products. Super fast answers to questions... And there are no dumb questions. Thanks Mike !!! Oh I have ordered the whole left side of the menu with these guys. Top notch. Great prices, quick shipping, and excellent service, can't ask for more.