Spikes through Glass

Spikes thru GlassEffect : The performer displays a clear glass piece about 4.5″ square in a slim wooden frame. This frame is now placed in another frame with doors on front and back with four holes in them. The doors are closed, and the Spikes pushed through the four holes, apparently penetrating right through the glass. 
The spikes are now removed, the doors opened, and the frame glass removed and shown to be completely unharmed.
We supply you all the required props, with photo illustrated instructions, so you can do this right away.