Heckler & Koch Mounting Plate, Fits HK VP9 OR to Holosun 509T, Black 51000792 The finest all-steel mounting solution for your HK VP9, VP9L, or model. Each solid billet machined steel optics plate is CNC machined from a solid billet of ordnance-grade steel, deburred, tumbled, and Cerakoted for maximum durability and appearance. Each unit includes 2 T20 steel Torx Plus screws for mounting the optic to the HK VP9, VP9L, OR model.