The sealey sx1821s features socket sizes of 21mm and 21.5Mm, perfectly suited to the mid-range wheel nut sizes commonly found across a wide variety of passenger cars, vans, and light commercial vehicles where swelling has rendered standard sockets ineffective. When a nut swells beyond its standard 21mm dimension, engagement becomes unreliable and risks rounding this socket's half-size increment ensures a firm, precise fit for controlled, damage-free removal. Built from tempered and anodised chrome molybdenum, it combines toughness with excellent corrosion resistance for reliable long-term performance. Slim socket walls allow use with impact tools even in restricted spaces, and the double-ended 6-point configuration with external sleeve keeps alloy wheels and nut faces protected throughout the job. Features and benefits: 21mm and 21.5Mm ends provide precise fitment for swollen nuts in this common size range tempered and anodised chrome molybdenum for corrosion resistance and durability thin walls for use with impact tools in confined spaces double-ended 6-point design for versatile application external sleeve prevents damage to alloy wheels and nuts 1 2 drive for compatibility with standard drive tools specifications: drive size: 1 2 socket sizes: 21mm x 21.5Mm