The Purple handle has extra fine teeth which is ideal for fine, small branches and hard wood, like carpentry and bamboo, bone and small palm fronds.  Great alternative to secateurs but delivering a brilliant smooth cut. 

The Blue handle has fine teeth and is suitable for small branches and larger hard wood, bamboo, bone and palm fronds.

The Black handle has large teeth.  This is ideal for medium-sized branches and is the best general purpose tooth size.

The Red handle has extra large teeth.   This is the saw to use for large branches and very sappy timber. 

The Yellow handle has extra large teeth.  Please note:-This one has a curved blade.