1. Single Knob Locking 15mm Double-Hole Pipe Clamp, Portable Locking 1/4 Hole Mounting Position For Multiple Expansion 2. Convenient Single Knob, Locking Double Tube Clamp 3. Universal 15mm Double-Hole Pipe Clamp For Photography, Suitable For Slr Cameras, Expansion Brackets, And Expansion Boards 4. One Knob Locks The Two Slide Rails; Convenient And Quick 5. Used To Connect And Lock 15mm, Aluminum Alloy, Carbon Fiber Photography Slide Rails Process: Treatment Product Type: Rail Mounting Base B: Packing Include:1*15mm Photography Slide Rail Connection Lock, 2*1/4 Screws, 2* Rubber Pads, 1*L-Shaped Wrench, 2 Carbon Fiber Photography Slide Tubes Note: Different Batches May Have Differences In Product Appearance, Color, And Printed Characters, Which Will Not Affect The Use Colour:black Material:Aluminum alloy Package Contents: 1 x 15mm Photography Slide Rail Connection Lock 2 x 1/4 Screws 2 x Rubber Pads 1 x L-Shaped Wrench 2 x Carbon Fiber Photography Slide Tubes Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.