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---------------2028角码------------------
用于EF2020,EF2040等铝材的连接固定
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---------------3030角码------------------
用于EF3030,EF3060等铝材的连接固定
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---------------4040角码------------------
用于EF4040,EF4080等铝材的连接固定
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---------------4040角码(薄型)------------------
用于EF4040,EF4080等铝材的连接固定
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---------------4545角码------------------
用于EF4545,EF4590等铝材的连接固定