Lyndex-Nikken BT40-SK25-120P Collet Chucks; Collet System: Slim Chuck ; Collet Series: SK25 ; Taper Size: BT40 ; Projection (Decimal Inch): 4.7200in ; Minimum Collet Capacity (Decimal Inch): 0.1880in ; Maximum Collet Capacity (Decimal Inch): 1.0000in