Cal. Lab. Code § 7326

There shall be securely attached to the outside window sills or frames of the window of any building, rings, bolts, lugs, fittings, or other devices to which may be fastened safety belts or other devices to be used, or which may hereafter be used by persons engaged in cleaning windows. The division shall, prior to the installation of any such bolts, lugs, rings, fittings, or other devices, approve such bolts, lugs, rings, fittings, or other devices as to their design, durability, and safety. Except as provided in Section 18930 of the Health and Safety Code, the division shall by appropriate rules and orders designate the manner in which said safety devices are to be attached, installed, and used.