Ensure your semi is Ready for the Road Aheadâ„¢ with enhanced driveshaft protection, with the Spicer 4.594" x 0.18" Welded Straight Steel Driveshaft Tubing. To deliver improved support while guarding against water, dirt, and debris, this replacement tubing encloses the internal components of the driveshaft or PTO driveshaft. Fashioned with an ultra-strong and durable body.