Low Profile high strength steel spoke wrench easily works on different nipples to adjust spoke tension & true wheelset. Each wrench works on two different sizes of spoke nipples 13G (3.5mm)/ Shimano® 4.3mm 14G (3.4mm)/15G (3.2mm) Mavic® M7/M9 Hardened Steel 5.3x 3.8x 2.3cm