1-1/8--12, 2-1/2 OD RND ADJUST DIE -3000E, Drillco, Mfr#: 30E208FE

The round split adjustable die may be adjusted through the screws on the holder. Adjustment on the open type is done by turning the three screws on the holder.A dieholder or handleisneeded forproperoperationofround split adjustable dies.