/ Precision Measuring Tools / Precision Hand Tools / Squares / Solid Squares / 20-12 * Not actual product image 50136 20-12 Master Precision Square 50136 Other similar products The Starrett 20 Master Precision Square is the finest precision-checking square. Squareness accuracy to .0001" (0.0025mm) every 6" (150mm). This hardened steel square is used when extreme accuracy is required. The beams and blades are hardened, ground and lapped to ensure parallelism and straightness. The beam is grooved at the inner corner for clearance of burr or dirt. Made of high quality tool steel, with the finest of craftsmanship throughout. 12" (300mm) Blade, 7" (180mm) Beam. Features Specifications Contact Starrett Features The finest precision-checking squares - not graduated. Squareness accuracy to .0001" (0.0025mm) every 6" (150mm) These hardened steel squares are used when extreme accuracy is required. The beams and blades are hardened, ground and lapped to ensure parallelism and straightness. The beam is grooved at the inner corner for clearance of burr or dirt. Made of high quality tool steel, with the finest of craftsmanship throughout. Specifications Blade Length (in): 12" Blade Length (mm): 300mm Beam Length (in): 7" Beam Length (mm): 180mm Material: Steel