Model Number: N360075 Brand Name: Shuangli Casters Key Specifications/Special Features: Wheel diameter: 3-inch, 4-inch, 5-inch (75mm/100mm/125mm)Wheel width: 1 1/4-inchCaster wheeltype: swivel caster wheelsWheel type: polyurethane/polyethylene coreWheel bearing: ball bearingHousing: pressed steel, bright zinc-plated, blue passivizedWheel dust guard: noneFoot brake: none Item number Wheel material Wheel diameter/inch Wheel width/inch Overall height/inch Thread diameter/mm Thread length/mm Wheel bearing Load capacity/lbs N360075 PU 3 1 1/4 4 3/8 12 30 Ball bearing 132 N360100 PU 4 1 1/4 4 3/8 12 30 Ball bearing 176 N360125 PU 5 1 1/4 4 3/8 12 30 Ball bearing 220