Drilling system tools for roof bolting used in underground mining, namely interchangeable drill steel in the nature of steel rods, drill couplings in the nature of connectors to join different sections of drill steel to create longer lengths of drill steel, drill chucks and drill bits

'bit':46 'bolt':6 'chuck':43 'connector':27 'coupl':22 'creat':36 'differ':30 'drill':1,13,21,33,40,42,45 'interchang':12 'join':29 'length':38 'longer':37 'mine':10 'name':11 'natur':17,25 'rod':20 'roof':5 'section':31 'steel':14,19,34,41 'system':2 'tool':3 'underground':9 'use':7

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