The nozzle comes pre-assembled with the rubber guard covering the actual nozzle so you can't accidentally scratch your car. They'll come in 25 Degree and 40 Degree with the ability for you to choose the proper orifice size for your specific pressure washer.
Size 3.0 = Kranzle KHD7/122TS (7-7.5LPM @ 1600-2000 PSI)
Size 4.0 = Kranzle KHD10/122 TST, K1152TST (10-11LPM @ 1600-2000 PSI)