This is a standard type ER40 Collet Nose Clamping Nut for ER40 Collet Chucks. It is a replacement part manufactured by RDG TOOLS. We are stockists of thousands of engineering tools and brands including Presto, Proxxon, Kreg, Tormek, Titebond, Gorilla, Veritas, Eclipse, Molyslip, Moore & Wright, Britool, Facom and more.