Steer a race car with complete confidence. When mounted in the engine bay, between steering box and firewall, the collapsible shaft will compress in the event of a frontal crash. The heavy wall, 1. 140" diameter tubular steel shaft has 3/4"-20 splines on both ends. The durable rubber boot keeps the sliding mechanism free of dirt and debris. Available in two lengths.Pit Stop USA offers Woodward Collapsible Steering Shaft Assembly - 13.5" Length (Collapses 5") ALL52171 at low everyday prices. Be sure to check out all of our products from Woodward including Woodward Steering Columns and Allstar Performance Steering Columns and Shafts.