Gray Ops CNC 4-Way Arca Anti-Rotate Black. Attach to bottom of scopes binoculars or anything with 1/4-20 threads. Specifications for Gray Ops CNC 4-Way Arca Anti-Rotate: Manufacturer: Gray Ops CNC Color: Black Fabric/Material: 6061 Aluminum Last Chance: Yes Features of Gray Ops CNC 4-Way Arca Anti-Rotate Machined from 6061 Aluminum Type II Black Anodizing 4 side dovetail design allows for mounting in the 90 180 270 360 degree directions Universal design for use with any Arca clamp Extra 1/4-20 in bottom for attaching to non-arca tripods Low profile design Package Contents: Gray Ops CNC 4-Way Arca Anti-Rotate Gray Ops CNC GO-ANTIARCA: 4-Way Arca Anti-Rotate Black