There is two types of saw blank in the market for people’s choices, non-silent saw blank and silent saw blank. Non-silent saw blade sounds louder than silent diamond saw blade when working, there is sandwich structure with a copper layer in between which helps decrease the noise. People also call it silent cut. The silent steel blank is mostly in U slot while the non-silent saw blade is in Key slot. It is a standard design, but in some market people also prefer U slot for the non-silent saw blank, and it is available from the saw blank suppliers as well.