This is a ring connector with a circular terminal for 14-16 AWG wire and #10 stud size. It features a brazed seam and serrated termination, with nickel-plated copper contact.
3M L-12-10 is a non-insulated ring terminal for 14-16 AWG wire with a #10 stud size. It features a butted seam, crimp termination, and tin-plated copper ETP contact.