Powerhobby 7075 Aluminum Roto Lock Motor Mount FOR Arrma 6S Fits all common motors with 25, 25.4 and 30mm motor mount spacing and up to 60mm diameter Pinion / Spur adjustments: 30mm mount motors (1/5th): 72 to 88 total tooth count 25mm mount motors (1/8th): 62 to 88 total tooth count Most Suitable FOR Hobbywing 1/8th and 1/5the motors Castle 1715 1717 1721 2028 TP40xx TP56xx and TP58xx type motors. Fits: Arrma infraction Arrma Felony Arrma Limitless