8Sinn Sigma MC-21 Support for S1/S1R/S1H cage Key Features: – Aluminum made – 2 screws support-to-cage attachment – 2 screws support-to-Sigma attachment   This product’s function is to support the Sigma MC-21 Adapter. 8Sinn Panasonic S1 / S1R / S1H Cage has dedicated openings prepared to place the support on the cage.   Set includes: 1pc 8Sinn Sigma MC-21 Support for S1/S1R/S1H cage Dimensions: Height: 19mm, Length: 39mm, Width: 24mm; Weight: 16g