mt6 weller smoother tip for sp23 and sp25d irons 4003019413379 1/8 3mm 037103473004 fits sp23 sp25d ns # 47300 tip shape:,ni plated copper made of copper, for weller soldering guns fits tool(s): 8200, 9200 with hex nut tip width o/d: .325 in./8.26 mm tip thickness/height/ i/d: not measured reach/length: .885 in./22.48 mm the important aspects of buying these products, for proper sizing, are the width, length and thickness of the tip. this product comes with a tip width of 0.325 in, length of 0.885 in and thickness of. this smoothing tip is designed to work with 8200 - soldering iron, 9200 - soldering iron. additional, and potentially important, information was collected about this product: tip height: 0.3 in