Need casing threads be cleaned and washed again?
套管丝扣需要再清洗一下吗？
Yesterday and today we have been c1eaning the casing threads.
昨天和今天我们都在清洗套管丝扣。
The outer portions of the guide shoe are made from steel, generally matching the casing in size and threads, if not steel grade.
引鞋的外部由钢制成，一般与套管的尺寸和螺纹匹配，如果钢级不匹配的话。
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