[25x] Round Dome Tipped Spring Loaded Pogo Test Pin - P160-D - By UPGRADE INDUSTRIES Shape: Rounded, Dome Current: 4 A continuous Diameter: 53 mil (0.0535 in / 1.36 mm) - Fits standard PCB drill holes snuggly. Uncompressed Length: 1.30 in (33.2 mm) Fully Compressed Length: 1.0 in (25.4 mm)