Petzl Hardhat Helmet Headlamp Clip Easily Put Your headlamp On Most Helmets (Pack of 4) Allows a headlamp to be installed on a helmet or Hardhat that lacks integrated headlamp clips Headlamp clips for thin-edged helmets 4 pieces Total - 2 For The Front & 2 for The Back Will Not Work On Full Brim Headhats