Kelly bar is the fundamental part of a drilling machine , and its quality instantly affects the performance of the whole machine.Based on the fat manufacturing experience and by absorbing the innovative technology both at home and overseas , we can produce fantabulous kelly bar which can be compared favourably with the imported ones . Interlocking Kelly bars are used with piling rigs for drilling in dense sand and gravel and frail to unattackable rock . The Interlocking Kelly bars manufactured by UNIMATE can be amply locked by mechanical locking system on each section . Kelly bars can be equipped with especially designed springs or pressure plates for shock absorbing purpose.