Lyndex-Nikken NCAT40-SK20C-18 Collet Chucks; Collet System: Slim Chuck ; Collet Series: SK20 ; Taper Size: NCAT40 ; Projection (Decimal Inch): 7.0900in ; Minimum Collet Capacity (Decimal Inch): 0.1380in ; Maximum Collet Capacity (Decimal Inch): 0.787