The teeth of these chisels could be set up on our “Detachable Round Pricking Iron”
Holes diameter: 1mm (inner diameter)
3mm 2+5+10 Prongs,
3.38mm 2+5+9 Prongs,
3.85mm 2+4+6 Prongs,
4mm 2+4+6 Prongs
This set could punch bigger holes and fits for round holes stitching compared with the round pricking iron.
The round pricking iron holes are small and fit for delicate leather works and for stitching turn over seam part which you don’t want the stitching thread exposed.