SK 25 Collet for improved performance over ER Collets.
Narower body to access tighter spaces
Better depth of cut on access and radial cut to to narrowness
8 degree taper increases gripping power over ER Collet
Increased contact between collet and chuck
Nut pushes parallel improving ragidity means tool
will not misalign or rock in the toolholder
65 Mn Spring Steel hardness