There are three types of DCS Drill collar slips: S, R and L. They can accommodate drill collars from 3in (76.2mm) to 14in (355.6mm) O.D.. The handling size can be adjusted by changing the quantity of the inserts or slip body. The products are designed and manufactured according to API Spec 7K. skype:lucky_lakepetro lucky@lakepetro.com