Arca-Swiss design, It fits all the Arca-type quick release adapters, which are made by many different companies such as Acratech, Arca-Swiss, Foba, Graf/Studioball, Gitzo, Novoflex, NPC and Wimberley. * This LP Series quick release plate for lenses is made of satin black anodized aluminum, with anti-twist flanges to trace the edges of the lens" tripod collar. * Dual Safety Stops. The safety stops at the front & back of the lens plate prohibit your lens from accidentally slipping out of the quick release adapter(easily removed with supplied hex wrench if desired). * Works with All Common Flash Brackets. Drilled holes accept flash arms from Kirk & Really Right Stuff. Dimension (H x L x W) : 11.80MM x 169.42MM x 38.10 mm * Compatible to following lens: (1) Canon Lens 400MM F2.8 non IS, 400MM F2.8 IS, 600MM F4.0 non IS, 600MM F4.0 IS, 600MM F4.5, 800MM F5.6 non IS, 800MM F5.6 IS; (2) Minolta Lens 600MM F4.0; (4) Pentax Lens 250-600MM F5.6 ED(IF), 600MM F4.0 AF SMCP-FA, 800MM F6.7 IF SMCP-67; (5) Sigma Lens 150-500MM, 300-800MM F5.6, 500MM F4.5 HSM, 800MM F5.6