1. Our heat-seal polybags are engineered for industrial fastener packaging. Thickened poly film provides outstanding puncture resistance against sharp threaded parts. 2. Firm heat sealing delivers reliable dustproof and moistureproof performance, greatly reducing the risk of fastener oxidation in long-distance shipping and warehouse storage. 3. Support customized dimensions, thickness, recycling symbol and pre-printed safety labels. Suitable for assorted screw sets, bolt packs and other small hardware assortments, stable supply for bulk OEM orders.