Snap-on Tools USA NEW 27pc 1/4 Drive. SAE & Metric Semi-Deep 6 Point Master Chrome Socket Set. Only includes the semi-deep sockets and the trays. (No shallow or deep sockets included). KA143METBK = 1/4 Drive Metric Tray. KA143FRBK = 1/4 Drive SAE Tray. TMMS4.5 = 4.5mm. TMMS5.5 = 5.5mm.