Empty, this cross-shaped base weighs 19.5 lbs and slides into position one-handed; filled with a sand and water mix it reaches 220 lbs, which is the ballast a cantilever umbrella needs before a gusty afternoon. Water alone brings it to 138 lbs and sand alone to 188 lbs. The four arms span 33 x 33 in and stand just 4.5 in high, so a chair leg passes over them. HDPE with metal fittings takes sun and damp without cracking or fading. It suits cantilever umbrellas from 8 to 11.5 ft and market umbrellas of 9 to 10 ft. Nothing needs assembling.