Zev Technologies Stainless Steel Slides were designed with tighter tolerances to increase accuracy and performance. There is a choice of 3 different sight configurations, as well as and variety of coatings for a more custom look. These are the best aftermarket slides available for Glock. Easy to install and Machined from Billet Stainless Steel then coated, these slides are a great addition to anyone's Glock collection. Machined from 17-4 Billet Stainless Steel to have tighter tolerances than a factory slide. DLC or PVD coatings offered have a Rockwell hardness rating above that of factory coatings.