LUNYEE 4pcs ER11-A Collet Clamping Nut With Dynamic Balance Holes

Conveniently keep multiple collets ready to go. Changing collets on the fly can be difficult, having a few spare for different size collets makes tool changes easy.
Package List: 2 x ER11-A Alloy Steel collet clamping nuts; 2 x ER11-A Hardened Steel collet clamping nuts.
Model: ER11-A; Material: Alloy Steel/ Hardened Steel. Precision ground and hardened. Suitable for ER type tool handle, toolbar, extension bar nut holding drill bit, boring cutter and other tools.
All nuts have dynamic balance holes, which can prevent wear and noise.
High precision, high concentricity, extend the service life of the spindle and reduce the rate of bit breakage.