The R607177 is a left-hand S-camshaft designed for 16½″ Q-style and Xtralife trailer drum brake systems. Engineered to OEM standards, this camshaft features a 1½″ diameter, 10-spline journal, and a hardened 02-style cam head for enhanced wear resistance. With a total length of 23½″ and dual journal grooves for secure mounting, the R607177 is compatible with a wide range of trailers using Dana-Spicer or Meritor braking systems.