A replacement set of jaws for a tap wrench. These are designed specifically for Harbor Freight's 40-Piece SAE/Metric Pittsburgh Tap and Die sets (https://www.harborfreight.com/carbon-steel-sae-tap-and-die-set-40-pc-62831.html) -and- (https://www.harborfreight.com/carbon-steel-metric-tap-and-die-set-40-pc-62832.html), but they may work for other sets.
The jaws are for use with 1/16" to 1/2" or M3 to M12 sized taps. Both the stationary and moving jaw have 6mm threads. The moving jaw is reverse (left-handed) thread. On three of my four wrenches, the stationary jaw has standard, right-handed threads, but for some reason, one has left-handed threads. Go figure. So... there are pieces to suit either situation.
Recommended settings are No Supports; 0.2mm Layer Height; 4 Walls, 4 Top and 4 Bottom Layers; 40% Infill.