Area 419 Zero Locking Die Ring Hybrid Pack 4 Rings Black. Finish on all multi-packs will be black nitride. Wrenches are aluminum so the finish is a black hardcoat anodize. Through the research and development process for the ZERO it became a testing bed for MANY reloading products. We needed to isolate variables and ensure we were testing the press and not just the dies/shellholders/etc. One of the major culprits we found for inconsistency was actually lock rings. MOST lock rings on the market are held into place by a set screw or they're split/clamp style. We found these to be inconsistent by design as they needed to secure themselves to the dies for constant removal/replacement in single-stage presses. Total thickness of rings is .500 and outside diameter is 1.685 NOTE: THESE RINGS CAN NOT BE USED IN EVERY SLOT ON A REDDING T-7 THE RING DIAMETER IS TOO LARGE. Specifications for Area 419 ZERO Die Ring Multi-Packs: Manufacturer: Area 419 Caliber: Universal Weight: 1 lb Color: Black Country of Origin: USA Package Contents: Area 419 ZERO Die Ring Multi-Packs Area 419 419-Zero-Hybridpack: Zero Locking Die Ring Hybrid Pack 4 Rings Black