We are Chinese manufacturer of seamless cylinder tubes, include cold drawn tubes, honed tubes, precision tube, skived and burnished tubes and chrome bar, piston rods For tubes: Material: St52, E355, A106B, CK45 and so on ID size: from 50 to 400mm ID tolerance: H8 Roughness: 0.4 Max Purpose: for hydraulic cylinder or pneumatic cylinder We are equipped with honing machine, cold drawn machine, skived and burnished machine, furnace and so on. For chrome bar: CK45, f7, usually chrome thickness 20-30 microns. product keywords: cold drawn steel pipe,hydraulic steel tube,hydraulic cylinder pipe,honing pipe,cylinder hones,cold drawn seamless tube,hydraulic cylinder honed tube,cylinder honed tubing,hydraulic pipe,hydraulic tube,honed tube,pneumatic tube,pneumatic pipe,chrome tube,skived and burnished tubeï¼? precision tube, precision pipe, chrome bar, piston rods, chrome shaft