Professional nut serts for commercial or occasional use 4mm M4 Nut sert pack 50pc M4 Rivet Nut Assortment Suitable for use with most materials that cannot be tapped or welded Dual action nut sert can be used as blind fasteners or screw anchor Aluminium nut serts so wont rust or corrode Nut serts provide a strong thread in thin materials that cannot be tapped Requires access to only one side of the work piece, nut can be installed after painting or other finishing operations to provide a robust screw anchor therefore eliminating problems of welding and material distortion Once installed they are permanently attached to the mating material, allowing the associated nut to be removed in service without risk of the fastener becoming dislodged Strong threads at least 6 turns, even on thinner materials Permanent and reliable fastener Serrations / grooves on the body to help prevent rotation Large flange reinforces the hole in thin materials and increases the pull out resistance Suitable for use with most nut serts tools (we also have these available in our shop) 4mm nut serts This listing is for a pack of 50 M4 nut serts SPECIFICATIONS • Thread diameter - 4mm • Sleeve inner diameter - 6mm • Sleeve outer diameter - 10mm • Pack size - 50pc