圆形裸端头:RNB1.25-3,RNBS1.25-3.5,RNBM1.25-3.5,RNBL1.25-3.5,RNBS1.25-4,RNBL1.25-4,RNBS1.25-5,RNBL1.25-5,RNB1.25-6,RNB1.25-8,RNB1.25-10,RNB2.3,RNBS2.-3.5,RNBM2.-3.5,RNBL2-3.5,RNBS2-4,RNBL2-4,RNBS2-5,RNBL2-5,RNB2-6,RNB2-8,RNB2-10,RNB3.5-4,RNBS3.5-5,RNBL3.5-5,RNB3.5-6,RNB5.5-3.5,RNBS5.5-4,RNBL5.5-4,RNB5.5-5,RNB5.5-6,RNB5.5-8,RNB5.5-10,RNB5.5-12;