Professional Nut Riveter 3mm 4mm 5mm 6mm Genuine Neilsen Product. This 11pc Threaded Nut Rivet Gun is designed for M3-M6 insert tool riveter rivnut nutsert kits. It includes fittings for 3mm, 4mm, 5mm, and 6mm nuts. Enjoy free delivery as standard and express delivery options. We offer 60-day returns for unused items, professional service, product support, aftercare, and a VAT invoice with every order.