The Bottom Bracket Gauge Tool was designed to provide all the necessary measurements to identify the proper bottom bracket for a specific bike configurationThe gauge can measure bottom bracket width, bottom bracket shell inner diameter, crank spindle length, crank spindle diameter and bearing inner diameterA metric scale runs along the long edges for measuring bottom bracket shell width and crank spindle lengthsDurable red anodized aluminum with laser etchingOverall size 7` x 3` x 0.125`Bottom Bracket GaugeRedUPC/EAN/GTIN: 811079026163