Package includes: There are 1 S690 double head pneumatic chuck, 2 closed flow pneumatic chucks and 2 open flow ball pneumatic chucks with clips, a total of 5, which can meet your different needs Double Head Pneumatic Chuck: Designed with 1/4 inch female thread, compatible with trucks, buses and other 2-in-1 multi-function pneumatic chucks, with the function of checking inflation and pressure, the maximum air pressure is 150 psi Closed Flow Pneumatic Collet: 1/4" female thread, rated up to 250 psi, it allows the shut-off valve to shut off air flow when the stem is not open, and only have air flow when the collet is open when engaged, Straight tire chucks are compatible with most vehicle valves; NOTE: When you use the air chuck to measure pressure or inflate the tire, use the clip to ensure the chuck seals against the valve stem Open-Flow Air Chuck: Designed to be compatible with tire pressure gauges, suitable for most situations, has a locking clip that holds the air chuck to the valve stem so you don't need to make the chuck to the valve stem, suitable for Trucks, buses, cars, bicycles and motorcycles Material: Our pneumatic collet kits are mainly made of brass, which is strong and durable, designed with good corrosion resistance and can be used for a long time