Package Includes 100 PCS Double-Hole Cord Locks, Hole Diameter(each): 5mm/0.2 inch, enough for your needs for DIY Snug Fit for Face Mask Good Protection These lightweight elastic band toggles will help you adjust the length of the mask ear loop cords and lock them tightly and securely in place, so the face mask can fit your face comfortably with a good seal for more effective protection. Premium QualityReusable, skin-friendly, easy to install, comfortable to wear and simple to sterilize. Non-toxic, environment-friendly, odorless, BPA-free, PVC-free, phthalate-free, latex-free. Safe for children. 100% Satisfaction Guaranteed . Easy to UseWith spring loaded design, easy to install and use Suitable for all disposable and reusable regular adult and kid size face masks and compatible with round and flat elastic bands with different widths. Multipurpose Sliding Cord Fastener Locks A functional Cord Locks designed to attach to drawstrings and tightens without the use of knots. Widely used for s shoelace, lanyard, luggage, pack drawstring, pants closures