The Hornady Lock-N-Load Deluxe Die Locking Ring Wrench is an ideal tool for your Lock-N-Load AP Press or for any Hornady die sets. The wrench is designed to hold the shellplate in place and keep it from slipping when adjusting the plate and securing it to the press. It also has three flats for tightening dies, spindle locks, and lock rings. Fits: 3/4" wrench for tightening die flats1/2" flats for tightening the spindle lock1-1/8" flats for tightening split lock rings