Durable Alloy Steel Construction: Crafted from durable alloy steel for long-lasting performance. Box End Design: Features a box end design that provides excellent access to tight spaces. 18mm Size: Compatible with 18mm nuts and bolts for versatile use. 12 Point Combination: Includes a 12 point combination drive for efficient torque. Powder Coated Finish: Resists rust and corrosion with a durable powder coated finish. The Craftsman 12 pt. metric combination wrench is forged from tough alloy steel, heat-treated, oil quenched and tempered for a uniform hardness and maximum strength. Nickel-chrome plated to resist rust and corrosion to simplify cleaning. Backed by Craftsman's Lifetime Guarantee.