Balanced to 25,000 RPM at G2.5. 0.0001 or better from taper to collet pocket. Taper ground to AT3 accuracy or better. Each holder lab certified for accuracy and balance. CAT 40, ER 25 Collet Chucks.CAT 40 x ER 25 - 4.00, slotted nut. Other Available CAT 40 ER 25 Collet Chucks. 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.