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These are New Custom Made Roller Bearing V-Blocks. These precision V-blocks were used for building Archery Spine Testers. They can be mounted two ways. They have a pair of 1/4"-20 threaded holes on the bottom which are 1-1/8" center to center.
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.