This is a ZEV Technologies OEM Part known as the Pin Kit, model ZT-PIN-KIT.
ZEV created the market for high end GLOCK upgrade parts and continues to offer the most extensive catalogue. From their renown triggers" slides and barrels to the smallest of springs" if you are a serious shooter ZEV has your upgrade. All ZEV Products are proudly made in the USA.
Features:
Grooved for Retention and Better Grip in Frame
Machined from Titanium
Easy to Install