UNICORP MMF1831-M06-F16-M4 6MM Hex Male-Female Standoff, M4 Thd x 20MM lg, Aluminum QTY-100 Go to amazon.com Related posts Top 10 best 20mm standoffs aluminum 2022 FeatureMale-Female Threaded StandoffBody Length (MM): 20.00Overall Length (MM): 29.53Shape: HexPlain Finish DescriptionUnicorp's male-female threaded standoffs are installed quickly and easily. They are used in circuit boards.