Standards:API-SPEC 5DP;API SPEC 7-1 Grade:E75;X95;G105;S135 SpeciFication:2 3/8";2 7/8";3 1/2";4";4 1/2";5";5 1/2";6 5/8" Hard Banding Arnco 100XT Arnco 300XT Arnco150XT Botn1000 Botn3000 Innernal Coating;TC2000;DPC;TK34and so on