Made of hardened carbon steel, high strength, hardness and strong shock resistance. These collet chuck blocks can be used for cross hole drilling at 60, 90,121 degrees or parallel, square or hex shapes, which is designed for CNC lathe tools and engraving machines, suitable for processing long parts. Collet chuck is easy to install on milling machines, lathes and drilling machines because of its high precision, which provide you with a simple operation experience. Color: Silver Material: Carbon Steel<br><br>Specification: ER32 Package Contents: 1 * ER 32 square collet chuck block 1 * ER 32 hexagonal collet chuck block<br><br>Specification: ER40 Package Contents: 1 * ER 40 square collet chuck block 1 * ER 40 hexagonal collet chuck block Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.