描述：Telephone bushing, insulated, coloured for 8 mm holes Ø4 mm bushing for insulated fitting in Ø8 mm holes. Optalloy coated brass, with 1 nut. Ø1 mm hole for cable, soldered joint. Length: 28 mm, head diameter: 10.5 mm. Coloured plastic. ### 4mm 插座 插头、插座、适配器和导线，带带隔套中心触点，用于要求高度安全的互连场合中。
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