SHELF CLAMP/Arinc, square, size: 3.175 x 3.175 depth: 7, aluminum, anodized finish. 64409B-10964409B-109 3-ATI Shelf Clamp | 3.175 x 3.174in, 7in DepthMSP avionics clamps eliminate the need for panel removal when repairing or replacing an instrument such as an altimeter or artificial horizon. These ..