All ring core drills are available with a straight shank or attached to a brass nut with standard 5/8″ -11, 3/4″-16, 1/2″-12, 2 1/2″-16 or 16mm x 2.0 female treads. Standard length is 1 1/2″.  Special lengths are available upon request. Some special daimeters may be available upon request. All drill cores in good condition may be retipped for new tool performance at a reduced price.
Note: Sizes are nominal shank sizes.  Holes will be drilled slightly large.