Burndy

1182587

Short barrel, tin-plated copper compression lug with one hole, inspection window, and 1/4" stud. Suitable for 6 AWG wire size. UL listed.

Vantex Electric Products

551847

No 2 lug with a 3/8" hole.

Vantex Electric Products

551869

No 4/0 lug with a 1/2" hole.