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The Norton 7700PT Arm Stud connects the arm to the slider in the track.  The Stud measures 1" overall length, including the stud head.

Norton 7700 Series Power Track Arm

Arm is shipped will all of the necessary hardware. This assembly includes the 7701ST-1AT Adjusting Head and Tube Assembly, and the 7701ST-1AR Adjusting Rod Assembly. The square shaft measures 7/16" x 7/16". The aluminum finish ships within 24 hours, dark bronze will take a little longer.

Norton Part # 7701ST-1A