5 قطعة HSS 60 درجة مجتمعة مخرطة مطحنة مركز مثقاب مثقاب مجموعة بت أداة
مميزات خاصة
5pcs HSS 60 Degree Combined Lathe Mill Center Drill bit Countersink Bit Set Tool
وصف
Description:
1. Center and spotting drills are traditionally used to make a conical hole for a lathe center in order to make a starting point for a standard twist drill, designed to prevent the twist drill from walking.
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