Sealey Adjustable Helmet Chin Strap Workwear Protective Equipment Safety PPE. This chin strap is designed for the Worksafe® 502 range of Vented Safety Helmets. Made from durable nylon, it is safe and long-lasting. The strap is very easy to install and simple to operate, offering great convenience. It is an excellent and reliable accessory, perfect for worker use and comfortable for wearing on safety construction sites. Model No. 503. Weight: 0.18kg.