K&L Supply Co. Three-in-One Truing Stand 910-720, requires purchase of this indicator arm Needed to mount standard dial indicator gauge 910-721, or metric dial indicator gauge 910-722, to the K&L Supply Co. Three-in-One Truing Stand (sold separately) Use it to build and true spoke wheels Check for run out on crankshafts Allows you to balance spoke and mag wheels, axles, and fork tubes Features rugged construction throughout, with ease of use