4-pcs ball transfer unit pack of 2

ball transfer unit can help you move things easily and comfortably.

• you can attach them under any thing that you wish to move and it will work efficiently.
• made of high-quality abs and 304 stainless steel.
• durable and wear-resistant, strong bearing capacity.
• adhesive design which directly paste it on the bottom of the box.
• caster easy rotation and precision ball bearings in the shaft make rolling easier.
• it rolls smoothly and quietly without making any harsh noises and it will not scratch the ground.