A型钻铤卡瓦为多片体结构，能适应钻铤磨损后外径尺寸的变化，具有重量轻、卡持范围大、牢固等优点。产品按API Spec 7K《钻井和井口操作设备规范》要求设计、制造。

Type A drill collar slips(Woolley Style) are multi-segments slips.They can accommodate the changes of outer diameter after the abrasion of drip collar.They are with light weight,large handing scale and reliable quaitly.This kind of slips are designed and manufactured according to API Spec 7K Specification for drill and well servicing equipment.