Every pipefitter, welder and even DIY's nedd a set of these mini two-hole pins. Each piece is made from corrosive resistant 6061 aluminum.  This assures light weight and excellent durability!  each of the four pieces are 1" in diameter and 1" long, with a 45 degree taper on one end.  All four pieces are drilled and tapped to accept a 5/16" threaded rod that is zinc coated, for corrosion resistance, durability and strength.  The threaded rod is 5/16"x4" long and will easily thread into any of the four pieces.  Two of the four pieces have a knurled finish to ensure a secure grip.  the other two pieces have a smooth finish.  All four pieces are machined for consistant measurements.  These alignment pins will accept bolt holes up to 15/16" and flanges up to 3" thick!  For the DIY's these can be used for a variety of things including holding any drilled project pieces together to free your hands to complete other tasks.  Whether you're a pipefitter, welder or DIY at least one set of these alignment pins are a must for your toolbox!