the square pipe polishing machine specifications: 1) Quantity of polishing head: 32-head 2) Polished pipe range: (F)75 x 45mm 3) Max. length of polished steel: 6m, can also produce according to your requirements 4) Charge speed of stainless steel pipe: 1 20m/min 5) Diameter of main polishing head's axis: 25.4mm 6) Motor power of polishing head: 3kW 7) Charge motor power: 3kW 8) Rotational speed of polishing head: 2,900r/min 9) Outside diameter of accessory rag wheel:320mm 10) Roughness of polished surface: Ra0.8 - 0.4/min