Two Vets Tripods Inc 55MM Dual Tension Ballhead w/Arcalock Dual Clamp Arca Swiss and Picatinny Black 3in. This innovative clamping system when used alongside the Area 419 Arcalock rail effectively eliminates the unwanted forward movement that often occurs when a rifle is clamped into standard clamps. What's even better is that this clamp is fully compatible with any Arca-style rail on the market as well as pitanny rails making it a perfect upgrade for any setup. Additionally the 55mm Dual Tension Ballhead has become increasingly popular since its launch. Featuring dual tension adjustments it includes a large knob for coarse adjustment and a smaller knob for fine-tuning allowing you to precisely dial in the perfect balance for your shooting style and needs. This flexibility has made it a favorite among shooters who demand accuracy and control. Specifications for Two Vets Tripods Inc 55mm Dual Tension Ballhead: Manufacturer: Two Vets Tripods Inc Color: Black Attachment Type: Picatinny Weight Capacity: 20 lb Height: 3.25 in Package Contents: Two Vets Tripods Inc 55mm Dual Tension Ballhead Two Vets Tripods Inc 55MMDUAL419: 55MM Dual Tension Ballhead w/Arcalock Dual Clamp Arca Swiss and Picatinny Black 3in