SBM Promaxx Flow Numbers

At 1 minute and 4 seconds I couldn't take the buzz'n anymore... LOL. Sounds like a swarm of mosquitos with a couple of bees in the mix. Not knocking their work or anything, but I'd need my own room with a shut door to do that all day.. LOL
No hearing protection in view, but it looks like they are wearing safety glasses, so I don't think we can call it a sweat shop.