305 - Sockets and Accessories170 - Wrenches34 - Striking and Struck Tools27 - Pliers32 - Screwdrivers45 - Miscellaneous Tools 613 pieces. 1/4", 3/8", 1/2", 3/4" drive tools. Designed for fastener sizes 1/16" - 2-3/8", 2 mm - 24 mm. Tools only. Modules contained: JCS-MAS-1, JCS-MAS-2, JCS-MAS-3, JCS-MAS-4, JCS-MOD613. Enhanced version of Proto® J99930 Master Technician Maintenance Set. PROTO 613 PIECE MASTER TECHNICIAN MAINTENANCE SET