For steel products: ( 1. ) seamless steel honed tubes / internal honed with external hard chromium plate tube / internal honed & hard chromium plate tube jis stkm 13c ( 2. ) high-carbon anti-friction bearing steel bar / hollow bar suj-2 ( 3. ) induction hardening chromium plate bar sae 1045 / jis s45c / din ck45 For aluminum products: ( 1. ) aluminum alloy tubes for pneumatic cylinder a6063 t5 ( 2. ) aluminum alloy profile tubes for pneumatic cylinder a6063 t5 For stainless steel products: ( 1. ) stainless steel chrome plate rods / grind rods type sus 303 / 304 / 316 ( 2. ) stainless seamless steel honed tubes / extra-thin seamless steel tube sus 304 / 304l / 316 / 316l ( 3. ) stainless seamless / welded industrial steel pipes ASTM a312 ( 4. ) stainless seamless / welded steel sanitary tubing ASTM a270 Thanks & Best Regards; Peter Hong / Foreign Dep. for Honest Prosper Industrial Co., Ltd. Tel:886-4-7983078 Fax:886-4-7995061 Skype:Honest Prosper