Sigma MC-21 | MC-31 Adapter Lock

This adapter lock secures the MC-21 (EF to L) and MC-31 (PL to L) adapters to the XLCS Cage, eliminating potential mounting failures and relieving strain on the native mount. Machined from high-strength aluminum and anodized black, it is specifically designed for the MC-21 and 31 Adapter from Sigma--and is the cleanest way to adapt lenses to your Sigma FP or FPL. Also Compatible with PYXIS 6K Full Metal Jacket. FOR VILTROX ADAPTERS, PLEASE SEE THE VILTROX SPECIFIC LISTING Includes: Adapter Lock, Mounting Screws and Hex Wrenches