all the nuts and bolts were now modified to the same convenient shape so that any fitter could be sent to any job with a comprehensive yet simple toolkit : 1 off pair of pliers ( for very small nuts ) 1 off pair stillsons - small ( for small nuts ) 1 off pair stillsons medium ( for medium sized nuts ) 1 off pair stillsons large ( as a substitute for a hammer and also for large nuts ) 1 off screwdriver ( for prising off nuts in awkward corners ) 1 off hammer ( if all else fails ! )