NecksGen Quick Release Helmet Hardware Kit is a replacement kit compatible with helmets pre-drilled for HNR (Head and Neck Restraint). The kit, typically used for the NecksGen Original and NecksGen REV, packs: (2) M6-1.0 X 12mm bolts, (2) Quick Release, (2) Backing Plates, and (1) 4mm Hex Key.