These are bare cast iron wheels made from good quality graded casting, machinable & free from blow holes. These wheels have very high load carrying capacity & are suitable for high temperature applications like ovens, foundries etc. The only disadvantage of CI wheels is that they damage the costly floor surfaces. Hardness of Casting : ( 175 ±10 ) BHN, Grade of Casting : FG200 as per IS-210, Maximum Working Temperature : 170°C.