#9577.3 Removable Ball Mount snaps into the top of the SLR Release Handle, or permanently in either end of the optional Removable Top Mount Assembly. The clamps of Quick Grip and Macro Grip Arm Systems attach to this #9577.3 Removable Ball Mount. Quick Grip and Macro Grip Arm Systems will also attach to the bottom of the SLR Release Handles. All Ball Arm Components interchange with this #9577.3 Ball, including #9577.72 Clamp that accepts TLC and Ultralite arms.