These centers are used to align dowel holes- you drill one hole, plop in the insert, align the pieces you want to join, and push them together, then drill the second hole where you just marked it. Nothing could be easier. OK, not drilling holes and making stuff would be easier, but not much fun.Get more detail about General Tools 888 1/4-Inch to 1/2-Inch Dowel Center Transfer Plugs.
