HSP
Measured across the inner flats 14mm is the socket size (M14)
.12 .18 RC Nitro Engine 2 Shoe Clutch Flywheel Bell Kit
.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