HSP
19.75mm outer diameter. 11.13mm inner diameter thread. 5mm wide.
.12 .18 RC Nitro Engine 2 Shoe Clutch Flywheel Bell Kit
.12 .18 RC Nitro Engine 2 Shoe Clutch Flywheel 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