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Acme Gun Drill Liners are designed to be used with
the replaceable inserts indicated in the table below.
All type GDL Bushings are ground concentric within
.0002" T.I.R. The heads are undercut and ground
square with outside diameters so the liner will seat
flat against the chip box.
Acme Gun Drill Inserts are
manufactured from thru-hardened tool steel and heat
treated to 62-64 RC for longer life. The I.D., O.D., and
face of GDI Bushings are ground concentric and square
within .0002" T.I.R. Inserts are stocked in
standard drill sizes only. We can manufacture special
sizes, and with special materials (i.e.Carbide or
Titanium Nitride coating) to meet your
requirements. | 
