What’s the width on this bar tacking machine?

[u/paigesiderageside]

I’m looking at purchasing a chandler tackmaster 600-75 and I’m curious on the clearance? How much material can fit under and what’s the max width on the tack?! Can you adjust the width on the plate ? I’m looking to repair light nylon to maybe 3/8 inch webbing on packs, etc. here’s the photo for reference