this kit is for all the 3XX bait caster reels. Lexa 300, Tranx 300 and Komodo 3XX.
Penn 400 HS bait caster.
This kit uses Item 1 the Duran MINI DFP clamp kit (Duran bottom clamp, HW and Allen wrenches and Item 2 Boilingtuna tuna composite trigger and screws.
Please see Duran webpage for more details. The Boilingtuna trigger replaces the Duran bottom clamp which is included.