Overhead Trolley Wheel Rollers (1 Pair)

These overhead 4-wheel rollers have a diameter of 2-1/8", Bolt Length of 4-7/8", Overhead wheel of 1-1/2". The Overhead 2 - wheel rollers have a diameter of 1-5/8", Bolt Length of 4-1/4", and Overhead wheel of 1-5/8". Estimated Capacity for a pair of 4-wheel rollers is 300 lbs. Estimated Capacity for a pair of 2 - wheel rollers is 150 lbs 2 Wheel Rollers have ball bearings for more stability.