In addition,different kinds of bolt products,such as recoverable bolt,grunting bolt with outer anchor inner grunt and base displacement of deep surrounding rock can be made by different bolt heads.

• 另外,采用不同类型锚头,可制成杆体可回收式、外锚内注式注浆锚杆和围岩深部基点位移计等几种不同用途的锚杆产品。