Cab Length Nerf Step Bar. Cab Length Nerf Step Bar; Textured Black; Special Order; 3 in. Patented Nerf Step Design. Nerf/Step Bar. Welded Step Pads Will Not Crack Or Break. At N-FAB are committed to building a heavy duty, high end, high quality tubular parts for all the latest trucks and SUV's dating back to the 80's.