Safety Plug for 50A Outlet

We have an active and growing makerspace here in Chattanooga. To keep everyone safe, I thought a safety plug for our 50A outlet was a really good idea, especially for smaller fingers.

This plug configuration is the same as Miller's 220v plug for many of their welders and plasma cutters.

50 amp, 250 volt, NEMA 6-50R, 2-pole, 3-wire outlet
Lowes: http://goo.gl/LlXakb
Home Depot: http://goo.gl/fdveIp