Super Heavy Duty Flat Iron Core Caster 2,500 Kg Loading Rigid / Swivel / Brake 12" × 3" Mining & Quarrying Heavy Fabrication Shops A04-1KU "SUPER HEAVY DUTY IMPACT-RESISTANT FLAT IRON CORE CASTER" SIZE: 12" × 3" (300-12) -- Load Capacity 2,500 kg per caster Product Overview This is the largest and strongest model in the A04-1KU Series -- our Super Heavy Duty, Impact-Resistant, Flat Iron Core Caster engineered for loads that push every other caster to its limit.