Mission S-Lock Rings – Shaft Lock. Use on the shaft to create a better grip with the flight. Mission S-Lock Rings – Shaft Lock – Pack 3 – Black-X2506 – these rings offer good durability and performance. Use on the shaft to create a better flight grip.Mission S-Lock Rings – Shaft Lock. Use on the shaft to create a better grip with the flight. Mission S-Lock Rings – Shaft Lock – Pack 3 – Silver-X2507 – these rings offer good durability and performance. Use on the shaft to create a better flight grip.