Used to remove wire insulation. Steps:

1. Adjust the position of the blade so it'll cut through the insulation. Push blade with tweezers if necessary
2. Pull wire through the tube

Works on solid / stranded wire 0.5 to 4.2mm thick (including insulation). Can drill or modify design if using thicker wire.

Requires:

1. Utility knife blade (see instruction pic)
2. Two M3x14 or longer screws, along with nuts and washers

Anyone can copy/edit the model with the free version of Onshape: https://cad.onshape.com/documents/3237d6fdcc7df491a0603229/w/020000b879efde3806393a8c/e/b15a69dca3e9c3a9ed05e07d?renderMode=0&uiState=655d75d7f0a56e12be5cfca7