"The Wimberley C30 quick release adapter accepts Arca-type quick release plates from Acratech, Arca-Swiss, Foba, Graf, Novoflex, NPC & (of course) Wimberley. From head-to-toe it is a superior, exceptionally engineered design which will yield many years of reliable, heavy-duty use. The C30 is long enough to hold any lens/camera combination like a vise grip. The C-30 is for those who wish to retrofit an old-style Wimberley Head, replace a damaged C-30, or have an application that requires a longer clamp. Please click here for a lens-plate reference chart to find the recommended plate for your particular lens.|Superstrong 7075 T6 Aluminum: Wimberley uses 7075 T6 series aluminum for the C30 clamp, which is a standard within the aviation industry and amongst the world's strongest aluminum alloys|Accepts all Arca-Type Quick Release Plates: The Wimberley C30 clamp will securely hold any manufacturer's Arca-type quick release plate, available from a host of manufacturers|Captive Locking Screw: The clamp's locking knob cannot accidentally fall off from being unscrewed too far|Built for Tough Use: Wimberley's C30 clamp has a tongue-in-pocket design which protects internal parts from dust and grit. The spring-loaded moving jaw communicates brilliantly to your hand that the camera's quick release plate and the jaw are in con|Grooves Allow Extended Motion: Shallow channels extending from the C30 clamp's sides stop just short of the central tapped hole, allowing great fore-aft adjustment when using the safety stops on Wimberley's (and others) quick release plates"