• Maximum Drill Chuck Capacity (Inch): 3/4"
• Maximum Drill Chuck Capacity (mm): 19
• Minimum Drill Chuck Capacity (Inch): 1/8"
• Minimum Drill Chuck Capacity (mm): 3
• Mount Type: Taper Mount
• Mounting Size: JT4
• Bearing Type: Ball Bearing
Extra accuracy, extra gripping power, for extra heavy duty work. The ball bearing super chuck is especially designed for EXTRA HEAVY DUTY drilling applications on production drilling machines, jig borers, milling machines, lathes and radials. The ideal choice for those jobs that require close tolerance drilling. The ball thrust bearing reduces friction in the chuck's closing mechanism, so the operator can apply more gripping power on the twist drill shank