Proto Hex Key 3/8 Round Head J46124B-SBD

Proto's professional-grade 3/8" standard arm hex key featuring a ball end design, engineered for high-torque performance in heavy-duty industrial, automotive, and mechanical maintenance. Forged from high-strength alloy steel and precision heat-treated, this L-key allows for an entry angle of up to 25°, enabling smooth engagement with fasteners in restricted or obstructed areas. Its precision-machined ball end ensures a secure, non-slip fit, while the industrial black oxide finish provides a durable layer of protection against rust and corrosion in demanding professional environments.
Key Features
Sized at 3/8" for exact engagement with standard SAE hex socket fasteners.
Ball end design allows for a 25° entry angle to reach obstructed or angled fasteners.
Manufactured from heat-treated alloy steel for maximum toughness and professional-grade durability.
Industrial black oxide finish offers superior resistance to rust, corrosion, and chemical wear.
Standard arm length provides a balanced profile for reaching recessed fasteners with substantial leverage.
Precision-cut ends facilitate full engagement with the fastener head to minimize the risk of stripping.