1) PREMIUM QUALITY: Forged from high quality chrome vanadium steel, with an advanced heat treatment process, our hex key set is built to last with performance in corrosion and rust resistance for long lasting use . 2) BALL END PATTERN: Designed with a ball end to access hex socket screws up to a 25 entry angle, allowing easier access to hard-to-reach places and facilitating adjustment from all angles. 3 ) COMPLETE SIZES: 9 long arm ball end hex keys include: 1/16, 5/64, 3/32, 1/8, 5/32, 3/16, 1/4, 5/16, 3/8 inch; 1.5, 2, 2.5, 3, 4, 5, 6, 8, 10mm. Featuring the most common inch and metric hex wrench sizes, this wrench set can easily remove and install most hex socket screws found in cars, furniture, equipment and more. 4) VISIBLE COLOR: Each heat-treated and chrome-plated Allen key also has a different highly visible color to make it easier to distinguish between different sizes. A textured non-slip surface for easy grip even with greasy and dirty hands.