Belltech Street Performance Lowering Rear Struts are designed as a performance replacement for today?s Strut equipped Trucks and SUV?s Shocks features include: Height adjustability, Hardened Chrome 18mm piston rods, Triple lip NBR rod seal, Teflon guide bushing, 35mm pistons w/ low friction Teflon seals, 51mm wide body for increased oil volume & OEM quality rubber bushings 2021 Chevrolet Tahoe / GMC Yukon 2WD/4WD 1-3.5" Rear Lowering