This kit has the contents that every Scuba Pro Tech should have. It's late Friday night and you are servicing regs that are due that weekend and that is exactly when one of these parts breaks or disappears !!
Make sure that you get a reputable service technician to service your regulators. Aqua Sport Scuba Center Inc takes no liability or responsibility for the service work done with the sale of any service kits. It's up to you to be a responsible adult and understand your risks and responsibilities. Training and experience is very important. Play safe !