[Size] - 1" diameter ball bearing roller, 360 degree rotation [Capacity] - The ball is made of bearing steel.Support up to 66Lbs/30kg each [Mouting Size] - Mouting Hole Diameter: 5.5mm/0.21"; Overall Size: 70x50x33mm / 2.8"x2"x1.3"(L*W*H) [Function] -…