A disc detainer is a type of lock mechanism that uses a rotating disc to secure the locking system. Unlike traditional pin tumbler locks, disc detainers rely on a series of discs that must be aligned correctly to allow the lock to open. Each disc has a notch that must be positioned at a specific angle, making it more challenging to pick. These locks are often found in high-security applications, such as safes and high-security padlocks. Their design provides increased resistance to picking and manipulation, making them a popular choice for securing valuable items and sensitive areas.