1.A na - eji nkwonkwo pup mee ka ịdị elu nke tojuru ogologo ma ọ bụ eriri eji arụ ọrụ, a na - ejikwa ya mezie omimi nke ihe mgbada mmiri.
2.Standard: API 5CT
3.Size: 2 3/8 ″, 2 7/8 ″, 3 1/2 ″, 4 1/2 ″ na ndị ọzọ
4.Grade: J55 / K55 / N80 / L80 / P110
5. Ogologo: 2FT / 3FT / 4FT / 5FT / 6FT / 8FT / 10FT / 12FT