Mount plate is CNC milled from 6AL4V Titanium billet, which has vastly superior mechanical properties to 6061-T6 Aluminum. This kit includes everything you need to mount the 507K/407K/EPS/EPS Carry/RomeoZero on your RMR cut slide. Plug and Play, easy to install, Sturdy and Stable. Not Fit RMR Cut Slide With Thread Post. Compatible with Holosun 407K/507K/EPS/EPS Carry/RomeoZero Not guaranteed to fit other reflex sights. Please note that it is not compatible with 407C/507C RomeoZero Please use screws labeled 407K/507K NOT FIT RomeoZero PRO Compatible with RMR Cut Slide Without Thread Post and Holosun 407K/507K. Not Fit RMR Cut Slide With Thread Post. Thickness: .08" thick Material: 6AL4V (Grade 5)Titanium. Lengthen Posts for the maximum thread engagement, Ultra Low Profile