Includes 3 of each screw size: M3: 11mm & 12mm Compatible with optics ready Sig Sauer P365 models including P365, P365XL, P365 XMACRO, and TACOPS. M4: 10mm, 11mm, 12mm, & 13mm Compatible with optics ready Glock 43X/48 MOS / Springfield Hellcat Pro OSP adapter plates. Note that these screws are NOT compatible with RMR Cut full Sized and Compact Glock MOS models like the 17/19/26/34 #6-32: 11mm & 12mm Compatible with S&W M&P 5.7/22 Magnum/Shield Plus/Equalizer models. Note* Screws may be compatible with other optics platforms. Check the specifications of your red dot mount before purchase. Red dot hardware is crafted from stainless steel and uses Torx T10 heads to prevent stripping. Recommended torque of 15 inch-pounds. Three screws of each type are included, providing a spare for lost or damaged screws. Screws come with blue loctite for secure mounting. All Monstrum products are backed by a lifetime guarantee