The seven piece E7 Swiss Burr set contains the following : A Universal Handle: Modern ergonomic handle design, with an easy to use spring release mechanism. Pulling back on the locking head collar releases the telescopic blade holder for optimal length. Works with all Swiss Burr holders and blades. An E type Blade holder for holding all E style blades. One of each of the following types of blade: E100 HSS Heavy Duty blade for use on straight and hole edges, for deburring materials with spiral chips. E101 HSS Heavy Duty Blade for use on straight and hole edges, E style shank with B10 cutting geometry, for use on materials with spiral chips and holes with a minimum diameter of 2.00mm. E200 HSS Heavy Duty Blade for use on straight and hole edges, blade design allows clockwise and anti-clockwise movement for use on materials with powdery chips. E202: HSS Heavy Duty Blade for use on straight and hole edges, E style shank with B20 cutting geometry, blade design allows clockwise and anti-c