Helical type reaming shell provides a good passage for drilling fluids.The matrix is wearproof,and its service life is long.

• 本产品唇部采用螺形设计，通水性能良好，胎体耐磨，金刚石包镶牢固，胎体与钢体粘结牢固。使用寿命长，国内享有盛名。