Self adjustment up to 3 mm Gel inside of the glide allows for gentle adjustment to uneven surfaces No spring action compared to spring loaded types No need to manually adjust Ideal for tables which are frequently movedBody: Black Body: Polyethlene Collection: SAJ30 Depth: 32 mm Height: 33 mm Load Capacity (kg): 50 (110 lbs) Nut (10): Steel Nut (10): Yellow Zinc Chomate Nut (12): Chomate Nut (12): Steel Screw: Chomate Screw: Steel Weight (g): 26