General description Ball Transfer Units are versatile tools designed for smooth and efficient movement in various applications. Featuring a 360-degree swivel mounting plate and a double wheel roller system, these units are ideal for both industrial and non-industrial uses, such as retail displays and airport luggage transfers. They serve as a perfect replacement for broken units on office chairs. Technical specifications Model Number: -15A Type: Window Rollers Treatment: Zinc Plating Length: 50mm Width: 30mm Height: 2mm Mounting Hole Pitch: 40mm Fixing Hole Distance: 4mm Ball Diameter: 15.875mm (5/8 inch) Single Load: 10kg (Max. 20kg) Single Weight: 43g Color: Silver Material: Carbon Steel Other information Package Contents: 10 * Ball Transfer Unit Note: Light reflection and different displays may cause the color of the item in the picture to differ slightly from the real thing. The measurement allowed error is +/- 1-3cm.