Very poor quality control. Used the correct 3/8 t50 staples and they didn't hold together properly. Inserted a clip that was fully and half bent, then spat out the second clip. And it would stick. So I looked closely and the piece that only exposed the first staple to be driven in was actually too wide and only covered part of the second staple so it spat out 2 staples every time. I needed it immediately for work and didn't have time to return it so I took it apart and filed a bit so it could only be held together one by one and it worked great after that. Warning, very difficult to disassemble and reassemble properly. Do not buy this item.