The Magpul M-LOK T-Nut Replacement Set is a replacement hardware pack designed for use with M-LOK accessories. Made of 4140 Chromoly Steel with a Mil-Spec Manganese Phosphate finish. The hardware set includes two T-Nuts as well as two different length button-head cap screws to ensure compatibility with various hand guard or forend sizes. A self-locking reusable thread patch is added to the screws to ensure a secure fit upon installation. Made in the USA.