Lyndex-Nikken NBT40-SK6C-150 Collet Chucks; Collet System: Slim Chuck ; Collet Series: SK6 ; Taper Size: NBT40 ; Projection (Decimal Inch): 5.9100in ; Minimum Collet Capacity (Decimal Inch): 0.0280in ; Maximum Collet Capacity (Decimal Inch): 0.2500in