Park tool four sided spoke wrench swunique four sided design provides extra strength and support and helps prevent slipping and deformation of aluminum nipples uses the same world famous design and high quality materials as the park tool three sided spoke wrenches featuresthe sw 40 is the same 323mm 0 127 size as the sw 0 blackthe sw 42 is the same 345mm 0 136 size as the sw 2 redbuy park tool workshop toolsfrom chain reaction cycles the worlds largest online bike store