ULTRA-LOW PROFILE Mounting Solutions For HK MP5/HK33/HK53 Firearms. Delivers an absolute co-witness for all Aimpoint Micro & HoloSun Sights & Lower 1/3 For The Trijicon MRO Sights. Fits all HK MP5/HK33/HK53 variants. Ideal for use with the Aimpoint line of T-1/T2 & H-1/H2, Trijicon MRO & HoloSuns type of optics. This mount is the lowest low profile mount available. Comes Complete w/Four Screws & Hex Wrench. Specifications: 6061-T6 Aircraft Aluminum Type II, Clas III Hard Black Anodized 100% Made In USA