Easily move storage dewars and dewars with canister storage systems. Sturdy cast aluminum frame has five wheels with ball-bearing swivel casters. Use AO-03773-71 03773-65 for dewars with 15.6 inch diameter base; use 03773-71 for dewars with 18.8 inch diameter base. Shpg wt 8.0 lb (3.7 kg).