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Adapter easily attaches to the core bit to convert 1-1/4”–7 threaded female arbor to 1/2” shank. The threaded section is around 40mm (1.57"). Core Drill Bit Adapter.
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.