Our Bolt™ marker clip is designed to securely hold markers and pencils. The clip is compatible with all Milwaukee® head protection including helmets and hard hats. It easily clicks into the head protection's Bolt™ accessory slots letting you use the universal accessory slots to clip in additional head protection accessories like ear muffs. The marker clip is part of Milwaukee® Bolt™ system that lets you adapt to your jobsite by adding Bolt™ accessories to your Milwaukee® head protection. All Milwaukee® hard hats and helmets are Bolt™ compatible.