4 piece key size: 8-9mm, 8-10mm, 10-11mm, 10-12mm Construction: Constructed of heat treated chrome vanadium steel with a high quality matte chrome finish for optimal corrosion protection for extended life, strength and durability. Eccentric Ratchet Design: The professional double-ended eccentric ratchet wrench set uses fasteners in tight spaces, creating room for your fingers, reducing rust and making it easier to get around obstacles. Ratchet Wrench: Reversible double ring ratchet mechanism with 72 teeth. One-handed quick switching, smooth clockwise and counterclockwise rotation. Easy and convenient: Our ratchet has a double ring design, which is more convenient to use. The dimensions of the tool are marked on the surface, which is easy to identify and difficult to scratch. VERSATILE: This offset ratchet wrench set is used for DIY, auto repairs, home repairs and most general repairs. Ideal for professionals and occasional craftsmen.