The Kelly offered are in types of square and hexagonal Kelly. Kelly joints are made from 4145H modified alloy bars that are well quenched and tempered. The hardness ranges from 285BHN to 341 BHN and the minimum impact value is 40ft-lbs per inch tested in condition of room temperature. Both ends and the drive section trepanned to provide true bores.
Thread protectors are furnished with the box and pin thread
Steel protection case provided for safe proper handling
The Kelly joints fully conforms to API Spec 7K and API monogram legally stamped.