除非买方指定，制造商无需提供辅助连接件用的筒形丝锥。
Provision of shell tappings for auxiliary connections is not required unless specified by the purchaser.
所述连接件(20)可靠地连接、固定和对齐所述壁轨，且不会占用所述u形壁轨的侧翼和背部之间的有用空间。
The connecting element (20) reliably connects, fixes, and aligns the rails in relation to each other without engaging in the usable space between the lateral limbs and the rear side of the U-profile.
在上述三角形左右二边的双面回复反射体的承托板上端设有连接件；
The double-face reflex reflection bodies comprise three double-face reflex reflection bodies which can form a triangle.
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