The aluminum alloy bracket flashlight and laser gun mount is specifically designed for M16. The dual ring on the top is for installing attachments with 25mm diameter. The bracket allows you to add flashlight and laser to your M16. There comes with a hex wrench for convenient to install. - Solid construction aluminum alloy shell - Double bracelet mounts - Caliber: 25mm - Length: 100mm - Fit for M16 and other long-barreled/short-barreled guns - Narrow mount - Can hold laser/flashlight and other accessories - Easy installation - Hex wrench included