Surface-mounted security bolt, model crr08, made of steel with a nickel finish, 86 b/70 mm, with 3 serrated keys, 86 mm plate and 70 mm pear-shaped cylinder, designed to reinforce security by installing it on any type of door. furthermore, being reversible, it is not handed - the internal operation is carried out by a button, while the external operation is carried out by a key through the cylinder.