Forged from high-grade S2 steel. IRWIN bits are between 58 and 62 on the Rockwell hardness scale. Works with hex head fasteners, also known as Allen wrench, Allen key, hex key or inbus screws. We manufacture a wide variety of point sizes to fit many different applications. All bits meet ANSI Standards. Includes 3/32-, 7/64-, 1/8-, 9/64-, 5/32-, 3/16-, and 7/32-inch bits.
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