Product Description:Heavy duty design. Extra large, extra strong, chuck itself weighted over 3 lbs. Special quenching treated key parts increases durability.Suitable for drill presses or lathes spindle accepts MT3 shankJaws are specially engineered to achieve balance. JT3 mounted.Chuck key and MT3-JT3 arbor are also included in the package. Product Features: Clamping Range: 3/16" - 3/4".MT3 Shank.Accuracy: 0.005"Chuck Length: 4.33" (w/o the shank)Chuck Outside Dia: 2.57" Please feel free to contact us. We are open Monday through Friday 8:00 am to 6:00 pm Pacific Time. Product Returns:All of our products are in brand new condition. Returns are accepted for defect products or incorrect shipping within 30 days upon receiving only. Full refund or product replacement is at seller's discretion. Buyer is responsible for return shipment and insurance fee. Shipping and handling fee will not be returned. Feedback:Our goal is to keep a 5-STAR rating in all categories. If you have any questions regarding our products or services, please give us a chance for correction. Please do not leave a negative or neutral feedback. We will do our best to fix it. Thank You! Froo www.froo.com | Froo Cross Sell, Free Cross Sell, Cross promote, eBay Marketing, eBay listing Apps, eBay Apps, eBay Application