IP03X 3/8″ NPT Industrial GoldPlug Magnetic Drain Plug External Head

3/8″ National Pipe Thread Stainless Steel Magnetic Drain Plug. Pulls metal particles from your oil.

3/8″ NPT actually measures 0.67″ in diameter.

3/4″ Hex Head

3/8-18 NPT Threads,  0.75″ External Hex, 0.75″ OAL