This product is a grey alloy steel adjustable house floor jack, with a size adjustment range of 11.8 in. to 16 in. and its purpose is to provide temporary support. Its main body is made of alloy steel, with a rated load capacity range of 6860 lb to 9920 lb . It can only carry objects within the rated load capacity corresponding to the height; exceeding the load capacity range may cause structural deformation, damage. The product has an adjustable structure. During use, it is necessary to manually adjust the height within the range of 11.8 in. to 16 in. according to the height requirements of the object to be supported, until it is in firm contact with the supported part. Its applicable scenarios are temporary support related to house floors, such as temporary reinforcement of the floor structure during house decoration and temporary support during the local leveling of the floor; it cannot be used for support scenarios unrelated to house floors. This product is only used as a temporary support tool and has no long-term load-bearing capacity; it is prohibited to be used for long-term and continuous structural support operations. During use, it must be placed on a flat and hard ground, and the contact surface with the supported object must be kept stable to avoid support failure caused by uneven ground or unstable contact. At the same time, it is necessary to avoid long-term use in humid and highly corrosive environments to prevent rust on the surface of the alloy steel.