Neewer 90 Degree Aluminum Alloy Rod Clamp Railblock for Inserting Side Handles/15mm DSLR Rod Rig Rail System to Mount Follow Focus/Magic Arm and Other Accessories Brings flexibile extension!Simply mount this product at the front or the back of your rig, you can insert handles or rod to your rig! You can adjust its mounting place on rod as per your need. Made of aluminum alloy, it can sustain easy breakage and delivery stronger performance in connecting and holding the rod. You can quickly mount or remove the product. No complex process is needed. Comply with industrial standard for better compatibility., fits rod of 15mm diameter.