The Union argued that the NYPD failed to negotiate over the use of angle grinders by bargaining unit members in connection with their parking enforcement duties and claimed that mandating their use to cut motorcycle chains was a unilateral change in terms and conditions of employment. The Union also claimed that there was a practical impact on employee safety due to the mandated use of angle grinders. The City argued that determining the methods of parking enforcement is a managerial right under NYCCBL § 12-307(b) and that there was no change to the duties of the employees. The City also claimed that the Union had failed to prove a safety impact and that the City had effectively mitigated any safety impact that had existed. The Board found the use of angle grinders was not a mandatory subject of bargaining. The Board further found that the City took steps to alleviate the safety risks to employees and did not find evidence of a remaining practical impact on safety. Accordingly, the petition was dismissed.