用于检查套管尺寸的多触点井径测量工具管串，采用结实的、安放位置经过优化的、弹簧加载的滚子及刚性臂扶正器进行居中。
The multifinger caliper tool string to be used for casing inspection was centralized using the combination of a strong, optimally placed, spring loaded roller and stiff arm centralizers.
螺帽，螺母，螺丝，套管，链条罗拉(滚子)及各种非标异形。
Nuts, nut, screw, tube, chain roller (roller) and the kinds of non shaped.
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