Detailed Specifications:

1. Use: Crank-American

   • This indicates that the bottom bracket bearing is designed for use with a crank that follows the American standard.

2. Fits: 1/Piece crank

   • This specifies that the bottom bracket bearing is suitable for a 1-piece crank system. This is common in some older or simpler bicycle designs where the crank and bottom bracket spindle are a single integrated unit.

3. Ball Size: 5/16

   • The ball size is 5/16 inches, referring to the diameter of the individual balls within the bearing.

4. Ball Qty: 10

   • There are 10 balls in the bearing.

This bottom bracket bearing is intended for use with a 1-piece crank following the American standard. It is a single-piece unit, and it contains 10 balls with a diameter of 5/16 inches each.