1.,Supply Metric and Inch collets 2,Power clamping ability,high precision 3,Competitive prices 1,Size:ER11,ER16,ER25,ER32,ER402,The detail specifications as follows: ER11 (0.5mm~7.0mm) ER16 (0.5mm~10.0mm) ER20 (0.5mm~13.0mm)ER25 (0.5mm~16.0mm)ER32 (2.0mm~20.0mm)ER40 (5.0mm~26.0mm)