The Really Right Stuff B76 Plate is designed for most spotting scopes with 1/4"-20 threaded holes. The B76 is precision machined from solid blocks of 6061-T6 aluminum. Fully compatible with any Arca-Swiss style quick-release system, the B76 features precisely contoured anti-twist flanges for a perfect fit that prevents twisting between the scope's foot and plate. This quick-release plate utilizes a custom machined 1/4"-20 threaded, captive-style mounting screw that threads into the tripod mounting socket of your scope.FeaturesCNC machined 6061-T6 AluminumAnodized, Type II black1/4"-20 threaded accessory mounting socket