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 provide 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 maximum thread engagement INCLUDED: Qty 1 - Optic Plate Qty 3 - 6-32 x .220 M3H Plate Mounting Screws Qty 3 - 4-40 x .320 FHB Holosun EPS / EPS Carry / SCS Carry Optic Mounting Screws Qty 3 - Patented 416 Stainless Steel T-Nuts Compatible FirearmsRMR Footprint Plates Compatible OpticsHolosun EPS, Holosun EPS Carry