Would this work for cutting 1/8 piece of window glass?

Don't listen to Tyler. Scoring and breaking is exactly how you cut glass, and this should work just fine. I cut all my glass with a similar device.

no. and don't try it, this is a tile BREAKER not a cutter, it scores the material then you snap it. trying that with glass will cause it to shatter and you'll get cut. I tried it with glass tile, doesn't work.