The Zev Technologies Duty slides feature the same workmanship and quality that ZEV is known for with a functionally driven design and utilitarian coating for the no-nonsense shooter who is looking to complete a new frame build or to enhance the functionality of their Glock. The black nitride finish provides a durable coating and the patented ZEV RMR cut enables the use of red dot sights using an RMR installation footprint. We've reduced the cost, but not the quality.Features Machined from 17-4 Stainless steel billet Lowered ejection port to aid in ejection of brass Match grade, precision milled tolerances that are tighter than factory Improved accuracy and grouping performance upon installation Torx wrench and two sets of RMR screws (tall and short) included