Sumner 780523 Hi Heavy Duty Jack Base Assembly

Shown with Vee Head attachment (not included)
Built for heavy use and has 2,500lb (1135kg) capacity.
1" square tube base construction and strut tension plate for superior lateral support.
Quick action lock washer for fast height positioning.
1½" (38mm) Acme fine adjustment thread - the largest in the industry.
Large, convenient adjustment handle.
Set screw can lock jack head to stand for transportation - no loose pieces.
Jack independently load tested for quality assurance.
Backed by over 30 years of jack stand manufacturing experience.
Patented Fall Guard™ feature allows 1" (25mm) safety zone around lock washer.

Head attachments: 780305, 780307, 780308, 780309, 780310, 780551