Description Made of high-strength and wear-resistant zinc alloy and plastic material, for use, tough to deform or break. Our threaded stem caster will not easily scratch your floor. Give your walker a smooth rolling experience, carry you more conveniences and comforts. These casters are a good replacement for little one 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 zinc alloy and plastic material, it's safe and delicate and will serve you for a long time. -Excellent manufacturing know-how makes it flexible and smooth, and might properly meet your needs. -The exotic design enhances weight distribution and comfortable operation, ease to waft and swivel -Reasonable design makes it carry out well and helps to produce a tender rolling action. -The threaded stem casters have quite a lot of and are compatible for most baby walker, trolley. 4