Combining precision engineering and powerful aluminum construction, this compact screw size identification ensures years of stable service in harsh environments while optimizing workflow efficiency Each corrosion resistant aluminum gauge features permanently engraved size markings and a swivel on the metal ring that allows for quick thread pitch and diameter checks without storing or losing it Designed for mechanics, engineers and enthusiasts, this essential thread measuring tool simplifies fastener identification in workshops, automotive repairs and home improvement projects Simplify industrial maintenance and home task by quickly matching nuts/bolts to exact thread specifications with this portable, colorfast error-resistant design measuring set This 26 piece aluminum alloy screw checker gauge provides a lightweight, rust-resistant solution for accurately identifying the screw size of 26 meters (M4x0.7 ~ M12x1.75) and Royal (#6 32 ~ 0.5 20) and accurately verifying nuts and bolts, Manufacturer: Pffiocix