It's the next major addition to the ARCALOCK family, the 3-position lever-release clamp. Since its release in 2018, ARCALOCK has been an industry-standard for fast, solid lockup between rifles and accessories. Now Area 419 are adding more options and versatility to that mounting with the QD Arcalock Clamp. KEY FEATURES 3-position reversible lever arm, milled from stainless steel, allowing you to choose between clamped, sliding, and fall-off. Steel adjustment knob, built for many years of reliable use Compatibility with existing accessories using 17S mounting footprint (Atlas and Thunderbeast Products, Two-Vets Tripods, Harris Bipod Adapter Kits, etc) NOTE: Mfg: Area 419