Caster Dia.: 4" , Caster Material: Poly on Poly , Caster Type: (2) Rigid, (2) Swivel With Locking Brakes , Caster Width: 1 1/2" , Color: Blue, Gray , Deck Type: Solid , Frame Material: Steel , Front Caster Material: Poly on Poly , Height: 36" , Includes: Includes (2) Rigid Casters 1 1/2" Wide, (2) Swivel Locking Casters with Brakes 1 1/2" Wide, Requires Minimum 1/4" Hose Diameter, and a Minimum if 72 to 100 psi , Installation Hardware Included: No , Material: Steel , Max. Travel Distance: 18" , Min. Air Pressure: 72 to 100 psi , Min. Hose Diameter: 1/4" , No. of Caster: 4 , Operation Type: Push Button , Platform Length: 36" , Platform Material: Steel , Portable: Yes , Power Source: Pneumatic , Rear Caster Material: Poly on Poly