Abstract: A channel support assembly formed by a pair of interlocking supports. The supports each have a base with a pair of latches including a series of crenelations a hook. A strut extends from the base between the pair of latches. The base includes a boss formed therethrough that has a throughbore that is dimensioned to accommodate a rod of rebar. A stepless height adjustment may be carried out by using a side adjusting screw that is clamped to the boss of support. The pair of supports may be interlocked into one of several positions based on interlocking between the hooks of each of the pair of latches interlocks with a corresponding one of the series of crenelations.