Review on POWERTEC 17201 Double Swivel Caster by Oscar Colangelo

I bought these for my Supermax 16-32 drum sander. They fit perfectly. Make sure you have some 1/2" coarse thread nuts and lock washers. I had nuts and lock washers. I like that the lock twists and turns. I rolled the mill into a driveway with a slight incline. They wouldn't let him to move and only blocked two rollers Only 4 stars due to defects that need to be replaced.