1,single brake chamber T30 and T24. 2,T24/24,T30/30 and T24/30 double air chamber. 3,Push pole:227and 255mm 4,black colr TYPESTROKER1R2L1L2PUSHROD THREAD LENGTH L4PUSHROD THREADAIR LNLET THREADMOUNTING BOLT THREADMOUNTING INLUDED ANGLEWEIGHTT2464116931102272075/8"-18UNF2A3/8"-NPTF5/8"-11UNC2A454KGST30641301061102552555/8"-18UNF2A3/8"-NPTF5/8"-11UNC2A454.6KGST24/2464116932242702075/8"-18UNF2A3/8"- ...