The B76 by Really Right Stuff is a multi-use plate designed for use with some camera bodies as well as collared, telephoto lenses, and feature a solid construction of 6061-T6 aluminum. The B76 is highly suited for use with any Arca-Swiss style quick release system, and features a perfectly contoured anti-twist flanges for an excellent fit which prevents twisting between the camera body contours or lens foot and plate. The B76 is outfitted with a custom machined 1/4"-20 threaded, captive-style mounting screw that threads into the tripod mounting socket of your camera body or lens foot. FeaturesCNC machined 6061-T6 AluminumAnodized; Type II Black(1) 1/4"-20 threaded accessory mounting socket Really Right Stuff B76 SOAR Multi-Use QR Fore-Aft Plate for Spotting Scopes RRS-9000470