set of 5 small hard nylon wheels with sealed stainless steel bearing. Diameter of wheel is 25mm to outer edges, 20mm diam accross  half moon grooved edge.(U) hole diam is 5 mm. wheel thickness is 7mm. each set comes with 4 spacers to enable them to be offset if required. I can supply stainless steel screws and nuts if reqd, contact me before buying  re screws 

If you require a large quantity of these wheels contact me for bulk price

If you are outside the UK please e mail me for postage costs to your country postage is only free within the uk

again-  depth of the "U" groove is 2 mm, overall diam is 24mm and hole diam is 5mm