WOBBLE EXTENSION BAR - 1/4" drive size SPECIFICATIONS - 1/4 Inch Drive Size with an overall length of 100mm (or 3.94 Inches) DURABLE MATERIALS - Made from Chromium-vanadium Steel Alloy for high strength and durability while having anti-corrosive properties TOOL ORGANIZATION - Sizes are stamped for permanent and easy identification of size SUPERIOR DESIGN - Spring-loaded detent ball design keeps extensions securely latched to sockets while offering a broader range of useable angles with the wobble end. ANSI STANDARDS - Meets or exceeds the standards established by the American National Standards Institute PROFESSIONAL GRADE - Genius Tools are designed and made for use by professional technicians and built to perform over a lifetime of heavy use. Trust Genius for a quality tool at a value cost to you