Techniks-SIMIS Brand New CAT 40 ER 11 x 6.00 18K RPM Balanced High Speed Economy Collet Chuck (with hex nut) for CNC Mill Techniks-SIMIS Collet Chuck Advantages. Balanced to 18,000 RPM.Taper ground to AT3 accuracy or better. Listings are described with detail information. This item is in the category "Business & Industrial\CNC, Metalworking & Manufacturing\Workholding & Toolholding\Workholding\Chucks\Collet Chucks". The seller is "hpcecs-online" and is located in this country: US. This item can be shipped worldwide.