Electronic Supply by Industrial Electronics in Milwaukee Wisconsin : Potter Brumfield, Radio Shack Stores in Milwaukee: Adjusting Knuckle with 1/4-20 Stud Adjusting Knuckle with 1/4-20 Stud ================================================================================ Staff on 05/11/2009 03:25:00 ADD 210° TILT, 360° TURN & ROTATION TO ANY INSTALLATION! For electronics with 1/4-20 mounting. * Full adjustability with knob and set-screw options and lockring included * Overall knuckle height approximately 2.5" (63.5mm) * Base drilled and tapped 1/4-20