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. Mfg: Brownells SPECS: 4" (10cm) long overall. Hardened steel bit. 13/16" (20.6mm) diameter. Plastic handle, color may vary.