8mm Triangle Key (aka "Gas Meter Key") used for Gas Meter cupboards. Also fits Budget type locks used on non secure applications. For more details refer below links

http://www.replacementkeys.co.uk/8mm-triangle-key.html or https://www.google.co.uk/search?hl=en&newwindow=1&safe=off&q=triangular+key+8mm&oq=triangular+key&gs_l=serp.1.5.0l3j0i30l7.1225242.1229866.0.1243392.14.13.0.1.1.0.1974.3988.3j5j4j8-1.13.0.les%3B..0.0...1c.1._ACHTe4FUeM

Print key and handle separately and glue it together for better strength. If anybody needs sketchup file please give me shout.

In picture of my printed key the triangle doesn't look perfect that's because it's in use since last few months. It works perfectly on lock of my water/electricity meter box.