The Metric Screw Checker is a rib tool for finish minute identification of both unrefined and amercement thread unit screws. This property tool made of heavy-gauge steel is satin-chrome plated, expertly & indweller made ! . All do-it-yourselfers, handymen, mechanics and maintenance people have too often the frustration and loss of worthy time and money by mistakenly identifying a screw. With this well-to-do to use, pocket sized tool you can those problems goodbye ! . No more, cursing, and quadruple trips to the hardware store ! . Unlike their pliant register parts, these screw checkers, made of lumbering gauge steel, will for a very long-distance time without the worry of wearing out the threads after a some uses.