The smooth operation of this compression latch design, aligns the pawl behind the frame and draws it up tight with a single continuous half-turn motion Its compression action provides consistent 6.4 mm (.25"") pull-up for environmental sealing in gasketed applications, and helps reduce or eliminate noise and rattles caused by vibration. Over-center latching resists accidental opening due to shock or vibration.Head style: 8mm hex. recess.E3-16-10.