1.ALLOW YOU TO DEFLATE FOUR TIRES AT ONCE:Just Screw Air Deflators One by One on the Standard Schrader Valve Stem and it ill Depress the Pin in the Valve Core to Start Air Deflating,On the Contrary, Simply Unscrew the Deflators Until They No Longer Depress the Valve Stems to Stop Deflating.Stuffers for Men and Women 2.EASY TO USE :Rapidly Air down the Four Tires Pressure without Removing the Valve Core, No Abrasion of the Valve Core and No Risking losing it 3.HEVAY DUTY DESIGN:Four 100% Solid Brass Deflators Screw on and off Each Other to Make One Unit, Come with a Key Rings, Easy for Use and Storage.Four Packs Black Tire Valve Caps as Replacement 4.PERFECT for ANY VEHICLE: Suitable for Car,Jeep,Truck, Motorcycle,Bicycle with Schrader Valve 5.COME WITH A KEY CHAIN:The deflators can be screwed together and with the key chain suitable for storage