Brownells Roll Spring (Pin) Holders are accurately drilled to hold tiny roll springs so perfect alignment is obtained. The 1/16" Roll Spring (Pin) Holder 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. This fine set has sizes 1/16" (notched), 5/64", 3/32", 1/8", 3.5mm and each made from 5/16" Hex High Carbon 5160 Steel that is Bainite heat treated for strength. Single groove in grip section and laser marked for quick identification. 100% Made in the USA.
Big Book Catalog, Issue:72, Page:427