The 405 from Adafruit falls under the standoffs & spacers category. Key specifications include a type of Round Spacer, a threaded/unthreaded of Unthreaded, a gender of Female, Female, a screw, thread size of #6, a diameter, inside of 0.151" (3.84mm) and a diameter, outside of 0.193" (4.90mm). This part has a typical lead time of 9 Days from factory and ships with a full manufacturer datasheet available for download. Simplytronix carries 405 in stock, backed by a genuine parts guarantee and quick dispatch.