Square D EZ Meter-Pak meter centers provide reliable, versatile, and compact multi metering equipment for multi unit residential and commercial construction. The main devices are available as main circuit breakers, main fusible switches, or main lug terminal boxes, and residential and commercial branches are available in ring or ringless type. EZ Meter-Pak meter centers have accessories and spare parts for field replacements and design flexibility. MMLRK is a clip for lever bypass meter socket with jaw release. This kit prevents installing Class 320 meter base upside down or from using a Class 100 or 200 meter base.