Lyndex-Nikken NBT40-SK10C-90P Collet Chucks; Collet System: Slim Chuck ; Collet Series: SK10 ; Taper Size: NBT40 ; Projection (Decimal Inch): 3.5400in ; Minimum Collet Capacity (Decimal Inch): 0.0350in ; Maximum Collet Capacity (Decimal Inch): 0.3940