Proto Single 3/8" Drive 21mm Metric 6-Point Socket, Chrome Finish, Built Tough for Everyday Use, Pro Mechanic Socket for Auto Repair, Garage, and Shop Work

Proto Single 3/8" Drive 21mm Metric 6-Point Socket
✔️ 1 socket, 3/8" (9.53 mm) drive, 21 mm (0.83") size, 6-point, steel

Need a solid socket? This Proto single socket grips nuts and bolts tight so you can turn them with a ratchet, breaker bar, or wrench, and it fits right in with auto repair, small engine work, and home garages.

✅ Pack size: 1 socket
✅ Brand: Proto
✅ Drive size: 3/8" (9.53 mm)
✅ Size: 21 mm (0.83")
✅ Measurement system: metric
✅ Points: 6-point
✅ Finish: chrome
✅ Material: steel
✅ Mfr part number: J5221MH

💡 When should you use a deep socket instead of a standard socket?
Go deep any time the bolt sticks out past the nut.

• Deep sockets reach nuts on long studs, U-bolts, and threaded rod
• Standard depth sockets fit better where space is tight
• Having both depths on hand saves time on most repair jobs