- WHITE USA- 1/2 JACOBS KEYLESS CHUCK WITH STEEL COLLAR WITH WHITE 7/16 HEX SHANK DRIVER. 7000 SERIES CHUCK. Its 1/2"-20 mount with 1/4"-20 left hand cap screw to prevent chuck reversal. 1/2" capacity. Great tool for Lineman.Condition is New. Shipped with USPS Priority Mail. Ships same business day if ordered before noon MON - FRI.