As TheKid said Brownells has the tool, expensive for what it is.

https://www.brownells.com/tools-cle...ruger-sa-center-pin-latch-tool-d743f444/

Or search for Drilled Spanner Bits and Screwdriver Security Bits, McMaster also has them w/ size chart.

https://www.mcmaster.com/products/security-bits/drilled-spanner-bits/