Tubular Driveshaft SRC2430-32 DMI-SRC2430-32 30" Long, 4340 Steel, 10 Spline Drive, 32 Spline Yoke DMI HOLLOW STEEL D/SHAFT 30" DMI & Bulldog are at the forefront of the short track racing industry, offering reliability and performance that's second to none. You can't focus on figuring out how to go faster if you're consistently replacing parts. And we know you aren't making money dropping out of races. That's why we dot every "i" and cross every "t" to make sure our parts outperform everything else on the market.