One of the most requested products we've had is for this Grace USA RSH-5 Roll Pin Holder Set. This five piece set is designed to accurately hold roll pins sizes 1/16", 5/64", 3/32", 1/8", 3.5mm so alignment is easily obtained. The 1/16" is notched to clear M16/AR-15 rear sights. The 3.5mm is excellent for holding the pin that retains the breech block on Sig handguns. These holders are made from the same 5/16" hex body that our others punches are made from for good control and they don't roll off the work bench. A single groove in the handle is for quick identification. Manufactured from high carbon 5160 steel and hardened from tip through working end by using Bainite heat treating process for extra strength. Made in the USA.