The thinner the saw blade, the smoother the cutting surface (for example, size: 2/0, 4/0 to 8/0 are fine teeth, specially used for metal sawing, suitable for cutting materials with higher hardness) Note: The thinner the saw blade, the easier it is to break. 6/0, 7/0, and 8/0 are only suitable for carved shapes, not suitable for cutting large-area materials. The thicker the saw blade, the faster the cutting speed (such as : 1# 2# to 6# are coarse teeth, specially used for sawing rubber, plexiglass and wood, suitable for cutting materials with lower hardness)