These track staples make it a lot easier to hold Atlas Code 55 Flex track where you want it before gluing it down. Each staple will take up to 6 T-pins to hold it down. On my t-pins the holes are a press fit which makes the staples a very secure way to hold the track down. The staples have groves that lock the track in the orientation you want and the pins drive between the ties. There is a straight staple and a staple that will allow up to a 10" radius curve.
The pins are a tight fit, On some of the pins I had to work the pin from both directions to get it through the staple. A little heat from a soldering iron would also work to drive the pins through the staples.