chuck because of small size and same chuck which comes in BT40 or big tapers , its very useful to increase length of a chuck and also used in turning machine where you have turret sleeve size smaller but straight, its also useful to OEM of machines like Multi Spindle machine and it comes in various sizes to fit in , from Smallest 8 mm to 40 mm are commonly available. This is made from high quality steel and hardened upto 50 hrc for long lasting life
ER40 Collet Range From 3mm to 26 Mm Standard , Suitable Spanner ER40 Um Fix Type
