Lyndex-Nikken NBT40-SK25C-90P Collet Chucks; Collet System: Slim Chuck ; Collet Series: SK25 ; Taper Size: NBT40 ; Projection (Decimal Inch): 3.5400in ; Minimum Collet Capacity (Decimal Inch): 0.1880in ; Maximum Collet Capacity (Decimal Inch): 1.0000