Casing 5-1/2" 23.0Ibs/ft P110 R3 premium  connection
18-5/8 Casing 87ppf K55 BTC R3
CONDUCTOR CASING 20" 106.5PPF BUTTRESS API5CT ERW WELDED CSG
CASING18 5/8 Seamless 87.5 PPFJ-55 BTC STD DD PSL1 R3
Standard:API 5CT
PSL1/PSL2/PSL3 Level 
Grade:J55,K55,H40,C90,T95,N80-1,N80-Q,L80,L80-13Cr,L80-9CR,P110-13Cr,L80-1cr,Super 13Chrome,Q125
Material:seamless casing steel pipe(ERW is also ok)
Threaded:BTC,LTC,STC,New
Couplings with PIN and BOX
Outer diameter:4 1/2"-20" (114.3mm-508mm)
Wall thickness:5.21mm-16.13mm Lb/Ft:9.5-40.5
Length:Range1(4.88-7.62m)
Range2(7.63-10.35m)
Range3.(10.36-14.63m) but in fact the range length is 10.36-11.9m,also in fact this kind is used commonly.
Certification:API 5CT,MTC (Material test certification)
The Third Inspection:SGS,BV,or according to clients needs.
Packing:In bundles by steel strips,with thread protector and nylon ring.