Park Tool SBC-1 - Spoke, Bearing and Cotter Gauge

A convenient aid for confirming the size of common bicycle parts. 

Fit the head of the spoke in the oblong hole and read its length on the easy to read scale

Holes in the centre of the gauge are used for sizing ball bearings and cotter pins

Anodised aluminium alloy with embossed markings to make the readings easy to read now - and for ever