Spuhr ARCA Rail Grabber 2.95in. To attach accessories the Rail Grabber has an ARCA Swiss interface in addition to a Spuhr Interface. An ARCA bipod/tripod can be attached directly or a short Spuhr picatinny rail can be mounted to the Rail Grabber. The Arca Rail Grabber can be rapidly and securely moved between positions along the Spuhr SICS rail. With a push of a button the grabber releases a set of pins to allow movement along the rail. Once the button is released the pins will lock into the desired position on the rail. Specifications for Spuhr ARCA Rail Grabber: Manufacturer: Spuhr Length: 2.95 in Package Contents: Spuhr ARCA Rail Grabber Spuhr CA001: ARCA Rail Grabber 2.95in