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These thread reducers convert a M6 (M6X1) threaded hole to a M4 (M4X0.7) threaded hole. These have a lip to allow you to fully tighten into your M6 hole. Total length on these is 13mm (threads are 11mm and lip is 2mm).
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.