Starrett 20-3 Master Precision Square

20 Master Precision Squares Steel Master Precision Square, 3" DESCRIPTION FEATURES SPECS DESCRIPTION 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. 3" (75mm) Blade, 2 3/8" (60mm) Beam. 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 insure 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. SPECS • Made in America: Yes • Blade Length (in): 3" • Blade Length (mm): 75mm • Beam Length (in): 2-3/8" • Beam Length (mm): 60mm • Material: Steel Catalog Number: 20-3 EDP Number: 50130