Lee Ultimate Spline Drive Lock Rings Pack of 3 Silver Aluminum. The new split clamp spline drive makes all other lock rings obsolete and clumsy to use. We started with custom extrusion of high strength aluminum with a splined exterior surface. We split the ring and added a cross bolt that when even lightly tightened applies a vice like grip on your dies. No tiny set screws that easily strip or damage your die threads. Then we added the famous Lee O ring because no matter how securely you have the lock ring clamped to the die it will loosen in the press during operation without the friction of the O ring. The O ring allows you to finger tighten into your press and it will never loosen during operation yet you can easily remove your die with finger pressure. We have also included a handy slim profile lock ring wrench works great when fitting dies on a turret or tool head. Dies are simply easier to install with the lock ring wrench. Specifications for Lee Ultimate Spline Drive Lock Rings: Manufacturer: Lee Quantity: 3 Weight: 0.08 lb Color: Silver Fabric/Material: Aluminum Features of Lee Ultimate Spline Drive Lock Rings Compatible with 7/8 x 14 threaded Lee reloading dies and Lee reloading presses. Torque type splined exterior for a no-slip grip. "O" ring anti-rotation included. Never loosens during use. Lock-ring wrench included. Package Contents: Lee Ultimate Spline Drive Lock Rings Lock-ring wrench Lee 90566: Ultimate Spline Drive Lock Rings Pack of 3 Silver Aluminum