ER11, ER16, ER20, ER25, ER32, normally owning these related size collets.
- Under 1.5KW spindle power, ER11 collet should be installed; to hold these size knives: 3.175mm, 4mm, 6mm, 7mm.
- Under 2.2KW spindle power, better to install ER16 collet; to hold these size knives: 3.175mm, 4mm, 6mm, 7mm, 8mm, 10mm.
- Under 3.0KW spindle power, ER20 collet should be installed; to hold these size knives:3.175mm, 4mm, 6mm, 8mm, 10mm, 12.7mm, 13mm.
- Above 4.5KW spindle power, ER32 collet should be installed; to hold these size knives: 3.175mm, 4mm, 6mm, 8mm, 10mm, 12.7mm, 13mm, 14mm, 16mm.