Source: Kuestenmacher, Simon, Types of Screw Drives, Twitter, 9/6/18, 10:35AM, https://twitter.com/simongerman600/status/1037756072168247296/photo/1.
Source: Kuestenmacher, Simon, Types of Screw Drives, Twitter, 9/6/18, 10:35AM, https://twitter.com/simongerman600/status/1037756072168247296/photo/1.