Park Tool SBC-1 Spoke ruler Cotter and Ball Bearing Gauge

This handy shop aid has remained more or less unchanged since we introduced it in the 1970s, and is still relevant today. To use, just engage the end of the J-bend or straight pull spoke in the oblong hole and read its length on the scale. With both metric and SAE length markings, The SBC-1 is also handy as a general-purpose ruler. Features gauge holes for quickly and easily determining the size of most common ball bearings and crank cotters. Anodized aluminum with embossed markings for easy reading and a lifetime of use.SBC-1 FEATURES SAE markings from 0-12.25 inches Metric markings from 0-310 millimeters Gauges for 1/4", 7/32", 3/16", 5/32" and 1/8" ball bearings Gauges for 8, 8.5, 9, and 9.5 mm crank cotters