Lyndex-Nikken CAT50-SK25-105U Collet Chucks; Collet System: Slim Chuck ; Collet Series: SK25 ; Taper Size: CAT50 ; Projection (Decimal Inch): 4.1300in ; Minimum Collet Capacity (Decimal Inch): 0.1880in ; Maximum Collet Capacity (Decimal Inch): 1.0000