do you have any requirement of cast iron parts? we have manufacture slat grate for pig and other animal, and our client are like it,if you have interest in it, we are glad to discuss further with you per your drawings. they are floor system used for farrowing crates and finishing hog,the material are ductile cast iron and grey cast iron. it have flat and firm surface; good appearance and practical; can fit with plastic floor. easy for use and clean; high tensile strength; long life . regards su fang export manager botou jiahe casting foundry add: #20 heping road,shijiazhuang,hebei,china tel: 0086-311-85379892 fax: 0086-311-85379862 mobile: 0086-13483117617 e-mail: shijiazhuang10@yahoo.com.cn