The combination square set comes with a stainless steel ruler, a square head, a protractor head, and a center head. They are made of premium steel which enables longer tool life and more reliability. Size: 12'', 4Pcs/Set, 4R. Used for set-ups. Layouts, checking heights, depths, angle set-ups., etc. Blades are fully hardened and tempered square head has level scriber point Made of Premium Steel. In contrast to iron steel, it provides significantly better rigidity, reliability, and quality. Easy-to-read satin chrome finished blades. Micro-fine blade graduations 4R Graduation: 8ths, 16ths, 32nds, 64ths Precision Measurement Tool: Hardened, tempered blade ensures durability and accuracy for layout, height, and depth measurements. Versatile Utility: Equipped with square head, level, and scriber point for multifaceted setup and marking tasks. Clear Graduations: Micro-fine 4R graduations (8ths, 16ths, 32nds, 64ths) on a satin chrome finish for enhanced readability. Comprehensive Set: Includes 4 pieces, offering versatility for a wide range of precision measurement and layout tasks. Professional Grade: Designed for machinists and fabricators needing reliable tools for precise setup and evaluation.