The contraction range of the inner diameter of T-type strong hose Hoop: not more than 10 mm. For example, if the inner diameter is 51mm, it is more suitable to use it on the outer diameter of the rubber hose. It can also be used on the rubber hose with the diameter of 41mm. Because it is a kind of strong hose clamp, and the screw rod is used for fastening, the contraction range is not as good as that of the American and British hose clamps, but its tightening ability is far better than those of the two types Hoop.