Park Tool SBC-1 Spoke Gauge Sizes spokes, loose ball bearings, and crank cotters. The SBC-1 is made of durable blue anodized aluminum, and issure to become a staple in your tool collection foryears to come. To use, just hang the head of the spoke in the oblong hole and read its length on the scale. Dont guess, measure! Features Durable anodized aluminum construction Metric and fractional embossed markings Related Articles: WHEN TO REPLACE A WORN CHAIN Manufacturer Part No: SBC-1 UPC: 763477006301 | Park Tool | Sbc-1 Spoke Gauge Sbc-1 Spoke Guage