57) Colour code for Bins for metal waste segregation is

58) The other name of crossing file is

59) The key which has a rectangular cross-section and it fits into the keyway cut on both the shaft and the hub is

60) The hammer which is developed for forging larger volumes of work and too big to handle in size is

61) Which indicates the amount of bond present between the individual abrasive grains and closeness of the individuals grains and closeness of the individuals grains to each other?