Collets set Material: 45 # steel
It is ER11 spring collet.
and wear-,Large holding force, wide clamping range.
Gripping Range: 1.0mm-7.0mm & 1/4 inch , 1/8 inch
Widely used in machining centers,general milling machines, CNC milling machine, engraving machine,high-speed machines, and other processing.

Color: Silver
Material: metal

Package Contents:
1 x 1mm Spring collet
1 x 1.5mm Spring collet
1 x 2mm Spring collet
1 x 2.5mm Spring collet
1 x 3mm Spring collet
1 x 3.5mm Spring collet
1 x 4mm Spring collet
1 x 4.5mm Spring collet
1 x 5mm Spring collet
1 x 5.5mm Spring collet
1 x 6mm Spring collet
1 x 6.5 mm Spring collet
1 x 7mm Spring collet
1 x 1/4 inch Spring collet
1 x 1/8 inch Spring collet