This is a tool for installing a trigger spring in a CZ 75/85 pistol or one of its clones. I used it for a Tanfoglio Witness Hunter in 10mm. Brass tools for this task cost ~$40, when you can find one. I printed it at 100% infill with ABS (because that's what I had loaded up). Installing the trigger spring was still a little tricky, but the tool did a good job holding the spring in place.