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How does a back-deburring countersink work?
Back-deburring countersinks (also called back countersinks) use spring-loaded blades: the tool passes through the hole, blades open, and cutting happens on the back side when retracting. Perfect for holes where the back face cannot be reached directly. Note: do not retract too fast - give the blades time to close. Lihao Technology can custom-make back-deburring tools.
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