Princeton Tec - Industrial Hard Hat Kit - HL-103. Industrial Hardhat Kit includes a durable rubber strap and 3M Dual Locks to help you mount a Princeton Tec headlamp on your hard hat.. Features:. Water Resistant: IPX4. Color: Black. Rubber. Hard Hat Strap. Box Dimensions: 2"H x 2"W x 3"L WT: 0.1 lbs. UPC: 795626004494