尺寸内径:φ20,24,28,39,43,48,49,50,52,54,55,58,60,62,63,65,68,70,74,76,77,80,82,85,89,90,93,98,102,104,110,112,115,120,130,133,140,180长度: 任意长度硬化: 经树脂处理加硬,提高产品耐磨性,延长产品寿命