MICRO-EDGE SIMM memory card sockets with metal latches to reduce breakage and heat resistant LCP housings . These PCB through hole mount MICRO-EDGE SIMM sockets have a 1.27mm centerline, a low insertion force, centre posts and positive polarization to aid accurate insertion. MICRO-EDGE SIMM sockets with stock numbers 681-2304, 718-4739 and 717-6696 have right polarization. MICRO-EDGE SIMM memory card sockets with stock numbers 681-2307, 718-4736 and 745-5047 have left polarization.