CLAMP/Arinc, size: 3 depth: 1, aluminum, chem-film (alodine) finish. Boeing certified. 64640B64640B ARINC Clamp | 3 x 3in, 1in depth, Chem-Film Finish, Boeing CertifiedMSP avionics clamps eliminate the need for panel removal when repairing or replacing an instrument such as an altimeter or artifici..