These spring loaded pogo pins PRT-10114 are 33mm (1.3") in length and have concave tips.
Spring loaded pogo pins are great for programming and applications where you don't always want headers soldered onto your boards.
The pins fit snugly into most standard perf board holes. Solder them just like you would normal wire.
Dimensions:
- Length: 1.3" (33mm)
- Travel: 1/4" (6.5mm)
- Head size 0.06" (1.5mm)