Prepare your semi to be Ready for the Road Aheadâ„¢, with the Spicer 4.594" x 0.18" DOM Straight Steel Driveshaft Tubing that provides enhanced driveshaft protection. By utilizing a sophisticated design, this replacement tubing is able to enclose the internal components of the driveshaft or PTO driveshaft to deliver improved support while guarding against debris, dirt, and water. Built with an ultra-strong and durable body.