Looking for an accessory for your lanyards? For safety and comfort reasons a slide is quite a nice feature to have in a lanyard. These high quality adjustable neck cord locks are designed for use with both round and flat lanyards. All you need to do is slip them on to your lanyard and then they provide a convenient spring-loaded locking mechanism to adjust the lanyard length. These neck cork locks will work with round 3/8" lanyards, flat 3/8" lanyards and with flat 5/8" lanyards and are available in your choice of classic black or pure white.