The utility model is characterized in that the utility model comprises an anchor backing plate with a through hole inside, and the anchor backing plate is a conical structure with a round end surface;
其特点是包括有一内部有通孔的锚垫板，所述的锚垫板是端面为圆形的锥体结构；
The utility model is characterized in that the utility model comprises an anchor backing plate with a through hole inside, and the anchor backing plate is a conical structure with a round end surface;
其特点是包括有一内部有通孔的锚垫板，所述的锚垫板是端面为圆形的锥体结构；
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