It features a 1/2 inch universal shank. The S 522 EF Flexible for Metal Reciprocating Saw Blade is designed for use with compact saws. Its fine tooth pitch (1.4 mm) cuts sheet metal with most common thicknesses. Moreover, the BIM (bi-metal) blade is engineered for long lifetime when cutting regular-strength sheet steel. Its fine tooth pitch enables cutting medium-thick sheet metal with a thickness of 1.5 mm to 4 mm. The blades short length (100 mm) has a cutting capacity up to 50 mm, while it is also ideal for use with cordless compact saws.