VEVOR 20 x 5 cm Heavy Duty Scaffolding Rubber Swivel Caster 4 Pack Dual Locking360 Rotation: The top plate equipped with premium steel balls, can rotate 360 degrees swiftly and smoothly with ease, easy to flexibly transform directions Solid Rubber Wheels: Made of high quality non marking rubber material, absorbs shock and vibrations, wear resistant and roll silently, protecting your floors from scratches Double Lock Mechanism: The locking mechanism can lock both the wheel and the swivel at the same time, which is essential for