Why do we call our 164 slot cars HO H0 ?

Why do we call our 164 slot cars HO H0 ? 1_64 slot cars A slot car or slotcar is a powered miniature automobile or other vehicle that is guided by a groove or slot in the track on which it runs 1_64 slot car Producer of the fastest, most detailed 164th scale slot cars since 1971 They etched their names into slot car history by building upon only the best

1_64 slot car A 164 scale race-themed HO build kit This kit is made specifically for HO scale slot car racing tracks and layouts It will work great with both permanent and

rebets splendour slot A slot car or slotcar is a powered miniature automobile or other vehicle that is guided by a groove or slot in the track on which it runs  High-Speed Slot Car Race Car Track Sets with 1:64 Slot Cars