Description Made of high-strength and wear-resistant zinc alloy and plastic material, durable for use, not easy to deform or break.Our threaded stem caster will noteasily scratch your floor.Give your walker a smooth rolling experience, bring you more conveniences and comforts.These casters are a great replacement for baby walker casters. Features -Color:As shown -Material:Zinc alloy, plastic -Size:6.50X4.30X4.00cm/2.55X1.69X1.57in -Screw thread interface:M-8 -Made of strong and durable zinc alloy and plastic material, it is safe and gentle and will serve you for a long time. -Excellent production technology makes it flexible and smooth, and can well meet your needs. -The unique design enhances weight distribution and smooth operation, ease to glide and swivel -Reasonable design makes it perform well and helps to provide a smooth rolling action. -Thethreaded stem casters have a wide range of applications and are suitable for most baby walker, trolley. Package list: 4 x Wheels