Traveling Block Application & Inspection
The traveling block (one of the rig components) is a diamond-shaped block containing several sheaves, always less than those in the crown block. The drilling line is wound continuously on the crown and traveling blocks, with the two outer ends, wound on the hoisting drum and attached to the deadline anchor.

Traveling block specs are much similar to crown block. The diameter and groove of the pulleys will depend on the drilling line dimensions we plan to use.
https://www.drillingmanual.com/traveling-block-rig/