This is How We Roll
These assembly-type casters feature precision-made, highly-durable metal balls which are supported by three stainless steel shafts. The low-friction design can be assembled as either 25mm or 35mm tall, with spacers included for further height adjustment, and is ideal for a wide range of Educational Construction projects.

Assembled Dimensions: (Width) 2cm, (Height) 1.1cm to 3.5cm