Turned from solid brass, these give a very professional finish. Also available bronze plated, ideal for use with darker woods. The cylindrical shelf support projects 3/8" and is 7mm in diameter. The sleeve is pressed into a drilled hole (17/64" or 6.75mm in softwood, 7mm in hardwood) and the post is threaded into the insert. No flange or seam shows.
Also useful for jigs and fixtures where you need a stop (e.g., a finger joint jig) but want to be able to remove it.