HSP
Measured across the inner flats 12mm is the socket size (M12)
.15 VX RC Glow Nitro Engine Rotary Carb Side Exhaust
.21 + RC Nitro Engine 2 Shoe Clutch Flywheel + Bell Kit 6mm Axle
.21 + RC Nitro Engine 2 Shoe Clutch Flywheel + Bell Kit 6mm Nut
.21 + RC Nitro Engine 2 Shoe Clutch Flywheel Kit 6mm Axle
.21 + RC Nitro Engine 2 Shoe Clutch Flywheel Kit 6mm Nut