Drill pipe slips can accommodate drill from3-1/2“ to 5“ (60.3.-139.7 mm) O.D. They are classified as type Short (SDS), Medium (SDML) and Extra Long (SDXL) according to gripping length. SDS slips are designed for shallow wells, SDML slips are the perfect choice for all mid- depth wells, SDXL slips are designed for deep wells.