Our specially designed, two-sided, square file greatly simplifies trigger jobs by establishing the required, precise, 90°, hammer hook angle. Saves those easily-worn stones for setting hook heights and putting on the final polish. Safe on two sides, cannot damage hammer, and safe to use with the various hammer/trigger sear jigs. Keeps its sharp corners and dead flat edges, even after extended use. Available with or without plastic handle (handle color may vary). Mfg: Brownells SPECS: 5" (12.7cm) lg. Tapers, .185" (4.8mm) - .180" (4.6mm).