SPECIFICATION: Material: Plates are made from 6061 aluminum. All mounting hardware is Stainless Steel Finish: Plates are MIL-SPEC Type III Hard Anodized - Black INCLUDED: Qty 1 - Optic Plate Qty 3 - M4 x 6 MM M3H Plate Mounting Screws Qty3- 4-40 x .320 FHB Holosun 407K / 507K , Vortex Defender-CCW Optic Mounting Screws Qty 3- 4-40 x .345 FHB CHPWS EDC / EDC Enclosed Optic Mounting Screws Qty 3 - Patented 416 Stainless Steel T-Nuts Agency / Department Discount Program DRY-FITTING DISCLAIMER: At C&H Precision, our products are designed and manufactured to meet tight tolerances. Installation can be affected by variations in your plate, hardware, optic, and firearm tolerances. For safe installation and to prevent potential damage to any component, we advise dry-fitting all parts before a full installation. If any problems arise during this process, please reach out to our Customer Service via our contact portal. IRON SIGHTS DISCLAIMER: When making aftermarket firearm modifications, factory components can often become obsolete, particularly when mounting optics on the slide, whether through direct milling or using a plate. Achieving the correct height for low co-witness iron sights depends on factors such as the firearm type, mounting plate, optic, and slide cut. For assistance in determining the appropriate iron sight height for your specific setup, please contact our Customer Service team through our dedicated contact portal.