Always wear protective eyewear when you use these. Little chips and shards can fly in any direction.
It's recommended that you use these while holding your glass over a container that will catch the pieces. Before you squeeze the handle, place a gloved hand over the glass to redirect all glass into the container and prevent glass shards from spreading into your work area.
A must-have for any mosaicist! Use these to nip your squares into little triangles, rectangles, flower petal shapes...or whatever else you need to fill in those awkward little spaces that no regular tile will ever fit.