Lyndex-Nikken NBT40-SK6C-90P Collet Chucks; Collet System: Slim Chuck ; Collet Series: SK6 ; Taper Size: NBT40 ; Projection (Decimal Inch): 3.5400in ; Minimum Collet Capacity (Decimal Inch): 0.0280in ; Maximum Collet Capacity (Decimal Inch): 0.2500in