ComfyGrip Snaps Plier. Fits both snap sizes, 9.5 and 11mm. Also, snaps parts vary in size slightly depending on Brand, so my pliers have instructions for dealing with this.

Also comes with 24 sets (approx) of 9.5mm basic snap parts. THERE IS NO DOMED / COLOURED ‘CAP’ INCLUDED WITH THESE - THE BASIC FINISHED SNAP JUST HAS A STEEL RING TO THE FRONT OF THE GARMENT, THE SAME AS ON THE REVERSE SIDE.