Semroc Engine Adapter Kit 18mm to 24mm SEM-EM-20-50
Engine mount and adapter includes the following parts:
1 BT-20J Body Tube BT-20 2.75" Long
2 AR-2050 Adapter Ring BT-20 to BT-50
1 AR-2050S Adapter Ring BT-20 to BT-50 Split
1 EB-20A Thrust Ring BT-20
1 EH-28 Engine Hook (Standard)