Protanium™ steel with Proguard™ corrosion-resistant finish. Tools fold into composite handle for easy storage. Chamfered tool ends provide a precision fit into screws. Hex blades rotate up to 270 degree . Includes 9 SAE sizes 564 in. through 14 in. and 7 metric sizes 2 through 8 mm. Manufacturer Warranty: Lifetime Warranty