Really Right Stuff's BLPD plate for Leupold Gold Ring and Mark 4 Spotting Scopes is custom designed and precision machined from solid blocks of 6061-T6 aluminum. Fully compatible with any Arca-Swiss style quick-release system, the BLPD plate features a precisely machined anti-twist key for a perfect fit that prevents twisting between the scope and the plate. All of the quick-release plates utilize a custom machined 1/4"-20 threaded, captive-style mounting screw that threads into the tripod mounting socket of your scope.FeaturesCNC machined 7075-T6 AluminumType III black anodizedFits Leupold standard mounting socket and key slot1/4"-20 threaded mounting holeAnti-twist key fits both primary body mount and extended body mount