This helmet adjustment accessory with a chin strap and button is great for those who require a reliable and adjustable . The BOA rotary lock mechanism allows for quick and precise adjustments, ensuring a comfortable and secure fit. Suitable for hard hats and sports helmet, this accessory is essential for maintaining helmet stability during intense activities. Its versatility makes it a must-have for construction workers, athletes, and outdoor enthusiasts. Features - Color: Black -Material:Plastic - Size: 32.00X12.00X1.70cm/12.58X4.72X0.67in -DIY fit: the helmet regulator can be adjusted to fit different head sizes, ensuring a secure fit for every user -Quick adjustment chin strap: the chin strap with button adjustment allows for rapid and precise fitting, making it easy to secure the helmet in place -Secure boa locking system: the boa rotator head lock provides a reliable locking mechanism, preventing the helmet from becoming loose during use -Lightweight design: constructed from lightweight materials, this accessory ensures that the helmet remains comfortable to wear for extended periods -Universal application: designed to be compatible with a wide range of safety helmet, this accessory improves overall safety and comfort Package list: 1 x hard hat chin strap 5 x buckles 1 melt adhesive