Drill Collars - Sunbelt Steel Integra drill collars come in a wide range of standard sizes and connections. Standard collars range from 2 7/8 IN. OD to 11 IN. OD, with optional features offered on most sizes, including slip and elevator recesses, spiraling and hard banding. Additionally, 11 1/2 IN. through 14 IN. OD collars are offered on request with optional fish necks available.