This 3 Pieces Cross Lock Picks Set is designed for 4-way cross (cruciform) locks, and it’s available with the following diameters: 6.0mm, 6.5mm and 7.0mm.
 
The cruciform, or cross lock, which is basically four different (sometimes only three) locks built upon a single key. Because of the compact keyway, the number of depths of cut for the key is reduced, making it a little easier to pick. You can check out the bitting on the key, but do not fully trust it. The bitting may not reflect the interior of the lock, but if there is no bitting on a side you can be sure that there are no pins on that side.
 
Be wary of the specialized lock picks as most are delicate and some are just ineffective. When purchasing tools, also pay attention to the size of your own lock’s keyway. Most tools will not fit every cruciform lock.