Technically speaking, these Superstar's Female Flush Bolts are a simple pair of replacement bolts for female axles, sitting flush against the dropout so there's nothing sticking out to catch, HOWEVER, Given the dimensions, you can also use these flush bolts in some some older 48-spline, 19mm spindles including original Profile 19mm Race cranks.

• Suits female axles/spindle with 3/8 x 24tpi threads
• Sold as a pair