Combination square set is designed for layout, setup, checking heights and depths, and setting angles. - It features a blade (scale) and square head. Number of Pieces / 2 Head Type / Square Blade Length (In.) / 12 in Graduation Type / 4R Graduations / 8ths/16ths/32nds/64ths Head Material / Cast Iron Finish / Black Wrinkle Blade Material / Hardened and Tempered Steel Blade Finish / Satin Chrome Features / Head has Spirit Level and Hardened Scriber Includes / Combination Blade and Head