Lock for internal sliding doors. Since it is simple to install, and given the considerable hook-striker tolerance, Scivola T guarantees perfect locking in all situations. Scivola T is a pleasingly smooth operating handle and key system. The head of the hook features a patented bit which acts as jig to mark on the jamb the centre of the notch for the striker housing. Scivola T is provided in kit including catches with handles and finger pull.