Magpul Industries M-LOK T-Nut Replacement Set Black. Made of 4140 Chromoly Steel with a Mil-Spec Manganese Phosphate finish the hardware set is supplied with 2 T-Nuts as well as 2 different length button-head cap screws to ensure compatibility with various handguard or forend thicknesses. A self-locking reusable thread patch is added to the screws to ensure a secure fit upon installation. Specifications for Magpul Industries M-LOK T-Nut Replacement Set: Manufacturer: Magpul Industries Condition: New Color: Black Features of Magpul Industries M-LOK T-Nut Replacement Set MAG615: Genuine Magpul Industries replacement parts for solid secure installations. 4140 Chromoly Steel with a Mil-Spec Manganese Phosphate finish. Package Contents: Magpul Industries M-LOK T-Nut Replacement Set MAG615 Magpul Industries MAG615: M-LOK T-Nut Replacement Set Black