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If you're looking for a door drill for any size door knob hole we've got the boring bit to handle it.

For non-standard sizes check out our full line of Boring Bits

Cutting Diameter	Shank Diameter	Overall Length	Material	Brand	Part #
2 1/8"	1/2"*	5 3/4"	Carbide Inserts	Southeast Tool	SEID218
Replacement Parts
14 x14 x20mm insert (Box of 10) for Spur				Southeast Tool	SI-141420
25 x 12 x1.5mm insert (Box of 10) for Plow				Southeast Tool	SI-251215
M5 Spur Screw				Southeast Tool	SEM5-SCREW
M35 Plow Screw				Southeast Tool	SEM35-SCREW
2-51HC Center Drill				Southeast Tool	SEC-POINT
2 1/8"	1/2"	5 3/4"	Carbide Tipped	Southeast Tool	SDK500
2 1/8"	1/2"*	5 3/4"	Carbide Tipped	Southeast Tool	SDK510
2 1/8"	3/4"*	5 3/4"	Carbide Tipped	Southeast Tool	SDK510-750
Replacement Parts
Center Drill				Southeast Tool	SDK560
Set Screw				Southeast Tool	SDK565
2 1/8"	1/2"*	5 3/4"	Carbide Tipped	Southeast Tool	SLOC600
2 1/8"	1/2"**	5 3/4"	Carbide Tipped	Southeast Tool	SLOC605
2 1/8"	1/2"	5 3/4"	Carbide Tipped	Southeast Tool	SLOC610
2 1/8"	1/2"	6"	Carbide Tipped	Southeast Tool	SE6100
2 1/8"	1/2"*	6"	Carbide Tipped	Southeast Tool	SE6100F
2 1/8"	1/2"	6 1/8"	Carbide Tipped	Whiteside	6100