The master mechanic spoke wrench is an investment cast workhorse poured from the best steel44 precisely machined44 heat treated for hardness then polished and platedthe result is a smooth44 solid steel spoke wrench designed and built to fit perfectly in your hand and provide years of every day servicea classic44 and maybe your new favourite toolblack is for 80 gauge 0127 inches 323 mmred is for 80 gauge 0136 inches 345 mm