Which one of the following is used for holding end mill ?

Collet chuck

Draw-in-bar

Boring head

Stub arbor

Collet

Draw-in-bar

'T' bolt

Boring bar

Hardness

Toughness

Resistance to wear

All the above

Softness of material to be machined

Hardness of material to be machined

Toughness of material to be machined

Brittleness of material to be machined

Wide surfaces

Narrow surfaces

'T' slots

'V' grooves