12" Three Square Bastard File Shopify Collective The ball end keys are

The ball end keys are made from 8660 nickel chromium molybdenum steel that's heat-treated to 54–58 HRC and the flat end keys are made from 6150 chromium vanadium steel that's heat-treated to 44–50 HRC

Part Number DWTSMR112-17X1

Part Number DWRRX

Part Number DWTSR1-1056

Part Number DWTSH2-1/4-16

12" Three Square Bastard File Shopify Collective The ball end keys areProduct Description Three square files are triangular in cross section, and are double cut and have fairly sharp corners that are slightly set and cut. These files are for general use by machinists for filing internal angles more than the right angle, for clearing out square comers and filing taps and cutters. Grading of cuts according to coarseness is the same as Square File. Brand Drill America Part Number DIC16214 Size 12" Material Carbon Steel