The Ledlenser Helmet Connecting Kit Type D lets you mount a compatible Ledlenser headlamp on a hard hat or safety helmet instead of using the headband, for construction, mining, rescue and industrial work. It is a simple holder for frontal attachment to the helmet by means of an adhesive pad. The kit is made of polycarbonate and fits these Ledlenser headlamps: MH3, MH4, MH5, iH5, iH5R. It is an accessory only; the headlamp and helmet are not included. Check your headlamp model against the compatible list before ordering, as each Ledlenser helmet kit type fits different lamps.