This MidwayUSA Tripod Tac Table ARCA Ball Head Hardware Kit allows a variety of mounting options for all your range day equipment. Intended to used with the MidwayUSA Aluminum Tripod Tac Table ( 126354). What's Included (1 Pack): Arca Clamp comes with the option of 3/8" or 1/4" threaded holeBall Head - Used to mount smaller items such as range findersPairs well accessories like our Weather Meter & Garmin Xero Mounts (285153 or 566522)1/4-20 Threaded Thumb Screw measuring 0.5" long