Appeal can produce the drill collar that your company needs.  Our drill collars are produced according to API Spec 7, and are of unbeatable quality.  Below is specific information on Appeal's drill collars:

Types: Slick or Spiral

Standard: API Spec 7

Material: AISI 4145H or non magnetic

OD: 3 1/8"-11"

Length: 31' maximum

Please contact us if you have any questions about our drill collars.  We look forward to quoting your drill collar needs.