Low Profile high strength steel spoke wrench easily works on 13G (3.5mm) / 14G (3.4mm) / 15G (3.2mm) and Shimano® (4.3mm) wheel set nipples to adjust spoke tension and true wheelset. NC machined for precise dimensions. Dimensions in mm (L/W/H): Diameter 4 x 1.3 cm Weight supplement: manufacturer's specs