Monstrum Replacement Screw Kit for Holosun Red Dot Battery Tray Compatible with Holosun 407k/507k/407c/508c/508t/509t. Compatible with Holosun 407k/507k/407c/508c/508t/509t/ACSS Vulcan/Comp models. Not compatible with Holosun EPS/EPS Carry. Hardware crafted from stainless steel with Torx heads to prevent stripping. Screws come with blue loctite for secure mounting. Includes 8 M2 Screws 4.5mm in total length with a head diameter of 5mm plus a 1.5mm Torx wrench. All Monstrum products come with a lifetime guarantee. Specifications for Monstrum Replacement Screw Kit: Manufacturer: Monstrum Diameter: 2 mm Length: 0.25 - 20 mm Head Type: Torx Type: Screw Kit Package Contents: Monstrum Replacement Screw Kit Monstrum T23: Replacement Screw Kit for Holosun Red Dot Battery Tray Compatible with Holosun 407k/507k/407c/508c/508t/509t