These 4 axles are of HO-scale (3.5mm:1ft) model railway wagon wheels., 24.5mm over pinpoints and 15mm back to back, suited to HO track. Snip the little stays that join the wheel backs to the cage, then snip the cage one at a time and flex it open to take them out. Check the clearance between the axleguards on the wagon you want to run on them, so that you don't damage the wagon or the axle pinpoints getting them in.