沉头内六角攻丝螺钉。
包括低压头，半圆头及平头螺丝以及特殊内六角圆柱头螺钉如排空，钻孔头，自锁，等等。
Includes Low Head, Button Head, and Flat Head Screws, as well as special Socket Cap Screws such as Vented, Drilled Head, Self-Locking, and more.
采用先进的制造工艺、专业生产高强度内六角螺钉，六角头螺钉。
With advanced manufacturing technics, Pengli specializes in manufacturing high-tensile hex socket screws and hex head screws.
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