They often are rated as the most efficient of all cutting tools, based on the length of the cutting edge in proportion to the amount of metal that supports it.
(They; are rated; as the most efficient of all cutting tools; T:often) (all cutting tools; based; on the length of the cutting edge in proportion to the amount of metal) (the amount of metal; supports; it)
They all cutting tools the amount of metal
are rated based supports
as the most efficient of all cutting tools T:often
on the length of the cutting edge in proportion to the amount of metal
it