Hog Saddle Black. Simply remove the factory Arca clamp from your ball head and install the J-Clamp. Now you have doubled the versatility of your ball head without having to purchase a completely new product. Or add the J-Clamp as an accessory to your Mod Dos tripod table. This is a self-adjusting clamp system that can mount to Picatinny or Arca Swiss rail systems. The self-adjusting feature allows for compatibility across many different tripod brands. The J-Clamp system is also user adjustable. Simply tighten or loosen the internal adjustment screw to add or lessen clamp tension to your specific brand of plates/rails. Specifications for Hog Saddle J-Clamp: Manufacturer: Hog Saddle Color: Black Attachment Type: Picatinny Weight: 4 oz Fabric/Material: 6061 Aluminum Package Contents: Hog Saddle J-Clamp Hog Saddle J-Clamp: J-Clamp Black