Includes 12-24 mm sockets in a storage tray. Snap-on® sockets using the Flank Drive® wrenching system grip the fastener on the flanks/flats which deliver 15-25% more turning power. Nickel-chrome alloy finish resists rust and corrosion. Manufactured from the highest quality proprietary steel, providing optimum strength and durability. 12-point configuration and Flank Drive® wrenching system.