(4)1/4F IPS Side Holes x 1/4F Top Hole x 1/4F Bottom Hole x 1-1/2in. O.D. x 1-3/4in. Tall Unfinished Brass. 6 - Way Disc Armback Large Configuration Top: 1/4ips Female Threaded Top Hole Bottom: 1/4ips Female Threaded Bottom Hole Sides: (4) 1/4ips Female Threaded Side Holes