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Proto J4990-4MXL Extra Long Hex Bit Socket
The Proto J4990-4MXL is a 3/8-inch drive, 4mm metric extra-long hex bit socket designed to provide extended access to deep, hard-to-reach fasteners. Manufactured from heat-treated alloy steel, this tool delivers industrial-grade strength and reliability. It features a corrosion-resistant polished chrome finish that simplifies cleaning and ensures long-lasting durability in demanding maintenance or assembly environments.
Technical Specifications
| Manufacturer Model | J4990-4MXL |
| Drive Size | 3/8 in |
| Hex Bit Size | 4mm |
| Measurement System | Metric |
| Overall Length | 6-3/32 in |
| Material | Heat-Treated Alloy Steel |
| Finish | Polished Chrome |
Frequently Asked Questions
What is the overall length of the Proto J4990-4MXL hex bit socket?
The overall length is 6-3/32 inches, which provides necessary reach for heavily recessed or obstructed fasteners compared to standard-length sockets.
What drive size does this socket require?
It features a standard 3/8-inch square drive, making it compatible with corresponding manual ratchets, extensions, and adapters.