Mechanical control. All Triune Business Furniture chairs are furnished with a standard control that has 4 specific functions. A 360-degree swivel. A tilt-back action which allows the user to tilt the entire chair backward for a change of position or to be more comfortable when you are not working on a desk or other surface. An adjustable tension which makes the chair either easier or harder to tilt. A tilt-lockout which prevents the chair from tilting backward.