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. Most of our plates feature a patented stainless steel T-Nut which provides an industry-leading six to seven threads of engagement. Since all the mounting hardware is replaceable, if any mounting hardware is damaged it can be replaced without replacing the entire plate. SPECIFICATION: Material: Plates are made from 6061 aluminum. All mounting hardware is Stainless Steel Finish: Plates are MIL-SPEC Type III Hard Anodized - Black Replaceable 416 Stainless Steel T-Posts for the maximum thread engagement INCLUDED: Qty 1 - Optic Plate Qty 3 - M4 x 6 MM M3H Plate Mounting Screws Qty 3 - 8-32 x .250 LSH Plate Mounting Screw Qty 3 - 4-40 x .250 FHB Optic Mounting Screws Qty 3 - 4-40 x .280 FHB Holosun 407C / 507C / 508T Optic Mounting Screws Qty 3 - 4-40 x .320 FHB Trijicon RMR Optic Mounting Screws Qty 3 - 4-40 x .345 FHB Trijicon RMR HD / SRO Optic Mounting Screws Qty 3- 4.40 x .370 FHB CHPWS COMP / EDC XL / COMP MAX Optic Mounting Screws Qty 3 - Patented 416 Stainless Steel T-Nuts Compatible FirearmsStaccato C, Staccato C2, Staccato CS, STACCATO DUO(TM), Staccato P, Staccato XC, Staccato XL Compatible OpticsC&H COMP, C&H Comp Max, C&H EDC XL, Holosun 407C, Holosun 507C, Holosun 508C, Holosun 508T, Osight X, Trijicon RMR, Trijicon RMR HD, Trijicon SRO