Machined from 6061 aluminum 9/16 diameter and very simple. No more taping screws or using some gadget to get the screw in the center of the hole when you use these. Simply bed them in the stock and take a slightly larger drill bit and slowly open the hole and your done. The hole starts at 1/4" so it can not cant off in any direction when installed. Groves are cut with chamfers to allow bedding to easily flow into the grooves.
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