Built-in Arca-Swiss dovetail mounting and includes a Quick Detach (QD) Socket for quickly attaching a compatible strap or sling. 3/8" & 1/4" threaded mounting holes. Two M3 screws are included for use as optional safety stops. Light-weight, low profile and provides the best possible stability for your lens. Hard anodized, aircraft grade aluminum for maximum strength and durability. Compatibility: Z180-600mmF/5.6-6.3.