CLAMP/Size: 3 x 4, depth: 1.5, aluminum, chromic-anodized finish, panel mount. 123-6123-6 Square and Rectangular Clamp | 3 x 4in, 1.5in Depth, Chromic-Anodized FinishMSP avionics clamps eliminate the need for panel removal when repairing or replacing an instrument such as an altimeter or artificial..