About KI8W's desk... unless you use heavy duty glass, like 3/8" or more, forget it. As a retired glazier, I drilled a lot of holes in glass. Not fun! With 1/4" (actually less these days), one stands very good chance of breakage, dropping, leaning or just looking the 'wrong' way. We have one desk with 3/8" top (30x60) that has lasted about 25 years. Dick Wilson K6LRN