The lightweight streamlined design of the Daniel Defense Rail-Mount Fixed Front Sight makes it unobtrusive and snag-free. The one piece design makes it easy to install on any MIL-STD-1913 rail and it secures with a slotted fastener threaded into a self-locking stainless steel thread insert through use of the Patented Rock and Lock Attachment Technology. Special attention was paid to facilitate the use of compact weapon-lights forward of the sight such as the X300 TLR-1 etc. The concave radius on either side of the sight is a great place to rest your thumb for easy ambidextrous activation of the light. Machined from 6061-T6 aluminum and military specification hard anodized our Rail-Mount Fixed Front Sight is both lightweight and durable and is the perfect complement to our A1.5 Fixed Rear Sight. Sight is set at Absolute Cowitness Height. Front Sight Post: 0.070″.