M4 threaded insert A threaded insert specifically designed to allow a strong permanent threaded hole in wood. The unique external thread ensures easy installation with a strong hold and high pull-out resistance, while the internal thread enables components to be fixed together. Installation is by simply screwing the self-tapping body into the material, with a pre-drilled hole being advised. Often seen in furniture construction, these insert nuts can be inserted to sit below the surface of the material if needed. A versatile and simple to use insert nut that's used across many industries by DIY enthusiasts and professionals alike. (Please note: These threaded inserts are zinc plated and could be supplied with a zinc and yellow finish or a bright zinc finish) M4 threaded insert specification: Size: M4 - 4mm Length (L): 10mm Diameter (HW): 7.3mm Diameter 1 (D1): 5.5mm Drive type (DT): Hex key 4m Hole size: 5.6mm - 6mm Finish: Zinc Plated This M4 insert nut is part of a growing range of threaded inserts for wood available at competitive prices from Fusion Fixings.