Apart from the honing or burnishing surface, Kotec Hydraulic also supply the Super Smooth Inside Surface (SSID) tube by oil drawing mainly for agriculture cylinder with low pressure and telescopic cylinder which requires high concentricity. Inside roughness Ra 0.80um max. After a swipe honing, the Ra value would be less than 0.50mm. SSID tube, the cost is more economical compared honed or burnished tube.