CLAMP/ARINC, square, size: 3.175 x 3.175 depth: 1, aluminum, anodized finish. Boeing certified. 9963B9963B ARINC Clamp | 3.175 x 3.175 x 1 in, Boeing CertifiedMSP avionics clamps eliminate the need for panel removal when repairing or replacing an instrument such as an altimeter or artificial horizon..