These are high quality breakaway strips which has female socket on one side and male pins on other side. Pitch 2.54mm(100mils)
High quality machine pin headers socket - break to fit. 40 pins that can be cut to any size. Used with custom PCBs or general custom headers. Why machine pin? Machine pins are round making better contact with IC sockets and connectors.
Unlike typical header strip which are not suitable for mounting to IC sockets, These can be useful in plugable modules to provide reliable mounting pins from its base PCB.
Socket and Pin Style: Machine Pins (Round)
Number of Pins: 40