Monstrum Red Dot Screw Kit Compatibility Across red dot Makes and Pistol mounting Platforms. Includes M3 M4 #4-40 #6-32 #6-40 and #6-48 screw patterns. Plus multiple lengths of each screw pattern for proper depth across different pistol makes and adapters. Monstrum Red Dot Screw Kit includes 3 screws each of the following screw types: M3 (11mm and 12mm length) M4 (8.6mm and 10.1mm length) #4-40 (6.35mm 8mm and 9.5mm length) #6-32 (8mm 9.5mm 11mm and 12mm length) #6-40 (9.5mm and 12.7mm length) #6-48 (8mm 9.5mm and 11.1mm length) 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 come with a lifetime guarantee. Specifications for Monstrum Red Dot Screw Kit: Manufacturer: Monstrum Length: 6.35 - 12.7 mm Head Type: Torx T10 Type: Red Dot Screw Kit Package Contents: Monstrum Red Dot Screw Kit Monstrum T16: Red Dot Screw Kit Compatibility Across red dot Makes and Pistol mounting Platforms