C Purlin: 1) Punch:can be punched 2) Brand Length:5.8m- ... 20mm b:30mm c:5 C Purlin:Specificationa:15mm b:30mm c:50mma:15mm b:40mm c:60mma:15mm b:50mm c:70mma:20mm ... b:30mm c:50mma:20mm b: ... 86-13484030065Fax: 86-0571-82896689-33Address: 15F, Unit A, Building 1, Tianhui Business Center, jincheng Road, Xiaoshan District, Hangzhou City, ...