This listing is of one drilling arbor for VMD100105-32-20 big bore drilling head. 
Details are as following:
1 X C40-32-50L drilling arbor 
(50 MM extension length. Arbor Total length:100 MM. There is a coolant hole through the arbor.)
The weight of this drilling arbor and drill bit  is about 1.5 KGS.
There are longer drilling arbor with extension length 100 MM, 200 MM, 300 MM, 400 MM and 500 MM.
For example C40-32-200L, its extension length is 200MM. 
40 means arbor shank diameter 40 MM. So this arbor can be installed in EJ40100 or BJ40120 round tool holder which have 40 MM bore.
Or the extension arbor can be install in side locking shank like the photo shows. 

Suitable drilling arbors for this big bore drilling head are of C40-32 series. They have 100, 200, 300, 400 and 500MM length available.

The smallest model big bore drilling head is 40 MM. The biggest model can be 200 MM.
So if customer needs other models just tell sino-sd Mr. Li.

Delivery will be less than 10 working days usually.

Have sales in China, Australia, USA.