Design - Two-piece jack stand for easy installation All moving parts fit snugly to avoid lateral displacement. With an adjustable height from 13.2 to 18.7 in. /33.53 to 47.5 cm and a removable lever for easy storage, it's both practical and space-saving. Designed to fit a standard 4 x 4 in. /101.6 x 101.6 mm wood post, it's ideal for everything from basement beam support to temporary construction needs Adjustable Floor Jack Post 13-17 Range of Adjustment,Mini Screw Jack,Telescoping Jack for Temporary Support YMSZGBZG 4 Pack Adjustable Floor Jack Post 9-13 Fiji For Crawl Space Adjustable Floor Jack Post 13-17" Range Of Adjustment, Telescoping Jack For Temporary Support 4pack Mini Screw Jack Although the Mini Screw Jack is small in size, it is big in strength and durability. Adjustable support jack for the floor, post floor joist jackstelescoping jack for temporary support, 10" to 13", black 2-pack SUPPORT - Perfect temporary or additional support for primary areas such as stairs, porches, decks, crawl spaces and heavy load areas. Simple to use: put the floor support at the designated position, adjust the large nut to a suitable height, and then lock the small nut.