This is a terrific and unique Creative Crafthouse puzzle box that may be perfect for putting gifts or surprises inside.Can also be nicely laser engraved with a name or message on the outer surface.The box has 5 sliding "keys" on each end.You must orient these keys in exactly the correct position to allow the cover to unlock.Not easy, but with patience it can be done.Outside dimensions of the box are 13cm x 7.6cm x 7.6cm .The available space INSIDE the box is 8.6cm x 5.4cm x 5.4cm The basis for the design of this puzzle came from Mr.Erhan Cubukcuoglu