Optical block assemblies having single or multi-stage folded light path lens assemblies that may be implemented to allow an optical block assembly to occupy significantly less space andor present reduced rotational inertia to an electrical articulating mechanism. The composition may include an alloy component to stabilize the alpha-iron matrix phase, during the sintering, in order to prevent the graphite solid lubricant from being solubilized in the iron. The poke-through assembly includes at least one intumescent member and an intumescent cover assembly.