Aluminum Construction, Arca-Type Compatible, Anti-Rotation Design, 1/4"-20 Mounting Thread, Integrated Strap Loop. The PBSVGC1EM Bracket Plate from ProMediaGear is an Arca-type custom quick release plate designed specifically for the Sony Alpha a7 a7r and a7s VG-C1EM grip. The plate is compatible with ProMediaGear flash brackets L-Brackets and other standard Arca-type accessories. Its custom fit is designed to match the body shape of the a7 a7r and a7s with the VG-C1EM grip attached preventing unwanted twisting or slipping when the camera is mounted to a tripod or other support. The plate is constructed from aluminum and features a hard black anodized surface coating for a scratch-resistant finish. The plate also features 1/4-20 threads for mounting other quick release plates or accessories.