This is a Genuine Mardave Racing Z Drive 50 Tooth Derlin Spur Gear 32dp.
Used in all 12th scale Oval classes and makes of car
Z Drive is the Original design by Mardave and copies do not have the same quailty
These gear require a Z Drive gear adaptor to fit a Mardave Z Drive Axle Part Numbers below
V20A is the gear adaptor , V10Z is the axle .
None Z Drive gears with 1/4" hole sold under Part numbers without the prefix Z - Use S1050