1,a full line of specificationwe 7 5/8"to 9 5/8" 2,standerd ... API 5CT Standard:API SPEC 5CTCasing serves as wall of wellSize size of casing: 4 1/2'',5'',5 1/2'',7 ... '',8 5/8'',9 5/8'' ,,13 3/8' OD mm(in ... /LCLC38.6910.36LC43.1611.5147.6212.65LC52.0913.72STCLC56.55 the grade of N80 ,J55 with API 5CT standerd casing