The Weller DS113 is a Thread-In Tiplet, 2.36 x 1.17mm, for Desoldering Tools DS80/ DS217/ DS227/ DS228/ DS229, is a threaded tiplet for desoldering tools, Plated for contacting solder, Stainless steel liner brazed to tiplet for better heat transfer, Entire tiplet is iron, nickel and chrome plated, then tinned, Chrome plating eliminates need to apply anti-seizing compound on threads.