Featuring surface mount spring-loaded design, PEM® ReelFast® Type SMTPFLSM™ Screws install precisely and permanently where designed on printed circuit boards to provide secure attachment and allow for subsequent access whenever necessary. All-metal captive screw assemblies mount in one piece using pick-and-place method. Available in thread sizes #4-40 through #6-32 and M3 through M3.5 and in multiple screw lengths, fasteners install in boards of any hardness as thin as .063 in.