This ER32 balance collet is made from high density stainless steel for durability and toughness. Great processing and fine making, it could absorb the shocking and the impact power. High speed, the maximum speed can be up to 30000rpm. Well packed in a container which can protect balance collet against damage during shipping or storing. Widely used on drilling machines, grinding machines, lathes, and other processing machines. Type: ISO30-ER32 Speed: 30000RPM Colour:Silver+black Material:metal Package Contents: 1 x ER32 Balance Collet Only the above package content, other products are not included. Note: Light 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.