Kit includes: (1) SHOCKWAVE™ 1-7/8" Magnetic Nutdriver 1/4" (49-66-4502), (1) SHOCKWAVE™ 1-7/8" Magnetic Nutdriver 5/16" (49-66-4503), (1) SHOCKWAVE™ 1-7/8" Magnetic Nutdriver 3/8" (49-66-4505), (1) SHOCKWAVE™ 1-7/8" Magnetic Nutdriver 7/16" (49-66-4506), (1) SHOCKWAVE™ 1-7/8" Magnetic Nutdriver Set (4 PC) (49-66-4562). Proprietary steel and heat treat process for maximum strength and durability. Strong magentic tip for secure grip. Color-coded band for easy size identification. Chamfered edge for fastening in tight spaces.