Ghost Armorer Tool (1). The GAT is made with a spring steel punch. The diameter is 3/32 of an inch or 2.5mm, this is the same as the OEM tool size. The difference is you will be able to press harder without bending the shaft of this punch. Just a better tool to work on your Glock with. Please note when selecting this item you will get one punch for each item added to the shopping cart. The picture of 4 punches is for illustrative purposes only.