Mount plate is CNC milled from 6AL4V Titanium billet, which has vastly superior mechanical properties to 6061-T6. Plug and Play, easy to install, Sturdy and Stable. Lengthen Posts for the maximum thread engagement Thickness: .08" thick The screws are made of SCM 435 material, which is quenched and tempered, and strengthened anti-rust for all-weather use. The customized length ensures maximum thread engagement. Update September 2022:This plate is machined to the toughest tolerances, perfectly fits in the MOS pocket to avoid recoil shearing the screws, and is super durable. Custom made for Glock 17 19 22 23 34 35 41 45 MOS Holosun 407K/507K/EPS Carry/EPS/RomeoZero.Not Fit 43X/48 MOS and aftermarket cut slide. Precision CNC Machined from 6AL4V Aerospace Grade Titanium.Ultra Low Profile and lightweight,never rust. One Piece Design for a Secure Zero Hold,Easy to install Installation hardware and tools included, we use high-strength alloy steel Torx head screws. Compatible with Holosun 407K/507K/EPS Carry/EPS/RomeoZero Not guaranteed to fit other reflex sights. RomeoZero Please use screws labeled 407K/507K Not compatible with 407C/507C and NOT FIT RomeoZero PRO Compatible with Glock MOS Models: 17 19 22 23 34 35 41 45 47 Fit 20 21 40 but will be narrower than the slide by .077 inches on each side. Not Fit 43X/48 MOS and aftermarket cut slide