The Right WAy To Take Off Base Pin Nuts
Engages both slots in the base pin nut on Ruger single actions so you can take the latch apart easily. The "teeth" are fragile; use this tool to hold the nut, turn the screw. Sorry, no breakage guarantee.
Big Book Catalog, Issue:70, Page:483
SPECS: 4" (10cm) long overall. Hardened steel bit. 13/16" (20.6mm) diameter. Plastic handle, color may vary.