The C&H Precision plates are designed, manufactured and shipped from our small family owned business in Coastal Georgia. Each plate is precision machined to the tightest tolerances on HAAS CNC machines and each plate goes through multiple quality checks before shipping to our customers. 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 4 - M3 x 6 MM FH Plate Mounting Screws Qty 3 - 4-40 x .320 FHB Holosun 407K / 507K , Trijicon RMSc , 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 Compatible FirearmsSpringfield Armory XDM OSP Compatible OpticsC&H EDC, C&H EDC Enclosed, C&H HNT-R Max, C&H MAX, Holosun 407K, Holosun 507k, Osight S