Lyndex-Nikken NBT30-SK10C-120 Collet Chucks; Collet System: Slim Chuck ; Collet Series: SK10 ; Taper Size: NBT30 ; Projection (Decimal Inch): 4.7200in ; Minimum Collet Capacity (Decimal Inch): 0.0350in ; Maximum Collet Capacity (Decimal Inch): 0.3940