Lanxri Standard 15mm Railblock Clamp 3-Port For DSLR Camera Rod Supporting System Product Feature 15mm three-port railblock clamp, knobs to lock Fits standard 15mm rod supporting system Central single 15mm railblock vertical Material: aluminum alloy Product Description It features standard 15mm double-rod holder clamp and secures the rods in place by two lock knob on either end, it's universally used to set up double 15mm rod support system. Central single railblock allows to attach another 15mm rod that is vertical to the double rods, so that you can use it to add accessories to support camera lens or something else. Net Weight: 76.3 g You Get: 1 x Standard 15mm Railblock Clamp 3-Port Before you place an order, please provide me with English information to facilitate our delivery and logistics