Lyndex-Nikken NBT30-SK6C-120P Collet Chucks; Collet System: Slim Chuck ; Collet Series: SK6 ; Taper Size: NBT30 ; Projection (Decimal Inch): 4.7200in ; Minimum Collet Capacity (Decimal Inch): 0.0280in ; Maximum Collet Capacity (Decimal Inch): 0.2500i