Pls send your best offer for the follow items  1. Drilling pipe 1.1 Drilling pipe type 2 7/8 IF right , 73 x 9.19mm - steel grade S135  - couplings: type NC 31 , outer diameter 101.6mm  - quantity: 3600 meters with length 8.75-9.82m/pcs ; 400 meters with length 6.01-7.3m/pcs 1.2. Drilling pipe type 2 3/8 IF right , 60.3 x 7.11 mm  - steel grade: S135 ; couplings: type NC26 , outer diameter 60.3 mm - quantity: 2700 meters with length 8.75-9.82m/pcs ; 300 meters with length 6.01-7.3m/pcs 1.3. Drilling pipe type 2 3/8 IF left , 60.3 x 7.11 mm  - steel grade S135 - couplings: type NC 26 , outer diameter 60.3 mm  - quantity: 2700 meters with length 8.75-9.82 m/pcs ; 300 meters with length 6.01-7.3m/pcs Steel grade according to API: S135 Standard API Spec 5 CT 2. Heavy weight drilling pipes  - type: round heavy weight drilling pipe 2 7/8" IF right  - dimensions according to API : NC 31 (2 7/8 IF) - material: prefabs from steel 46MoMnCr10 - I, II, III  - forged semi products according to API RP7G , Spec 7  - outer diameter: 4 1/8 in (104.8 mm) - interior diameter: 2 in (50.8 mm)  - length: 31 feet (9.45m) / paces - weight: ~ 51.8kg/m (~ 473kg/pcs) - quantity: 30 pcs  Delivery term : 7 tranches , maximum 360 days