Nylon—Nylon wheels are impact- and wear-resistant. They work well on smooth surfaces.

Polyurethane Rubber—Polyurethane rubber wheels combine the abrasion resistance of plastic with the shock-absorbing qualities of rubber. Their aluminum core adds strength to the wheel without sacrificing cushioning. Use them on smooth or rough floors and in areas with debris.

Thumb-Wheel Adjustment—Turn the thumb wheel to lower or raise the leveling pad.

Nut Adjustment—Nut adjustment requires a wrench to move the leveling pad.

Dual-Raceway Bearing—Dual-raceway swivel bearings swivel more smoothly than ball bearings.