second connector unit 2 a second vertical wall 48 of the lower half 4 is formed parallel to the first vertical wall 33 and in connection with the partitions 44 and comprises in the middle thereof a rectangular opening 481 to accommodate the narrow portion a 3 of the pcb a and a pair of through holes 482 located on both sides thereof and aligning with the body holes 215 of the second connector unit 2 when assembled the through holes 332 of the upper half 3 the body holes 215 of the second connector unit 2 and the through holes 482 of the lower half 4 stay in a line to insert the bolt 252 into the interlocking members are assembled to the upper and lower halves 3 4 and each includes a latch member 5 a press member 6 and an enforcement plate 7 the latch member 5 is an elongated metal plate and includes a hook portion 51 at one end thereof for engagement with appropriate latch means of the complementary mating connector not shown a middle portion 52 defining a dowel slot 57 corresponding to the dowel post 412 of the upper half 3 a retention portion 53 formed with a plurality of stators 58 on opposite sides thereof and a resilient portion 54 obliquely and inwardly extending from the retention portion 53 furthermore the retention portion 53 has an outward spring 59 opposite to the resilient portion 54 the press member 6.