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Decimal Equivalent
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Measurement System
Drill Size
Decimal Equivalent
Overall Length
Max Drill Depth
Fractions
1/4"
0.25"
4"
2.37"
Drill Bits, Titanium-nitride (TiN) coated, 1/4" X 4"
Letter
E
0.25"
4"
2.37"
Drill Bits, Titanium-nitride (TiN) coated, E X 4"
Letter
F
0.257"
4 1/8"
2.49"
Drill Bits, Titanium-nitride (TiN) coated, F X 4 1/8"
Letter
G
0.261"
4 1/8"
2.48"
Drill Bits, Titanium-nitride (TiN) coated, G X 4 1/8"
Fractions
17/64"
0.2656"
4 1/8"
2.47"
Drill Bits, Titanium-nitride (TiN) coated, 17/64" X 4 1/8"
Letter
H
0.266"
4 1/8"
2.47"
Drill Bits, Titanium-nitride (TiN) coated, H X 4 1/8"
Letter
I
0.272"
4 1/8"
2.46"
Drill Bits, Titanium-nitride (TiN) coated, I X 4 1/8"
Letter
J
0.277"
4 1/8"
2.46"
Drill Bits, Titanium-nitride (TiN) coated, J X 4 1/8"
Letter
K
0.281"
4 1/4"
2.51"
Drill Bits, Titanium-nitride (TiN) coated, K X 4 1/4"
Fractions
9/32"
0.2813"
4 1/4"
2.51"
Drill Bits, Titanium-nitride (TiN) coated, 9/32" X 4 1/4"
Letter
L
0.29"
4 1/4"
2.5"
Drill Bits, Titanium-nitride (TiN) coated, L X 4 1/4"
Letter
M
0.295"
4 3/8"
2.62"
Drill Bits, Titanium-nitride (TiN) coated, M X 4 3/8"
Fractions
19/64"
0.2969"
4 3/8"
2.61"
Drill Bits, Titanium-nitride (TiN) coated, 19/64" X 4 3/8"
Letter
N
0.302"
4 3/8"
2.61"
Drill Bits, Titanium-nitride (TiN) coated, N X 4 3/8"
Fractions
5/16"
0.3125"
4 1/2"
2.71"
Drill Bits, Titanium-nitride (TiN) coated, 5/16" X 4 1/2"
Letter
O
0.316"
4 1/2"
2.71"
Drill Bits, Titanium-nitride (TiN) coated, O X 4 1/2"
Letter
P
0.323"
4 5/8"
2.82"
Drill Bits, Titanium-nitride (TiN) coated, P X 4 5/8"
Fractions
21/64"
0.3281"
4 5/8"
2.82"
Drill Bits, Titanium-nitride (TiN) coated, 21/64" X 4 5/8"
Letter
Q
0.332"
4 3/4"
2.94"
Drill Bits, Titanium-nitride (TiN) coated, Q X 4 3/4"
Letter
R
0.339"
4 3/4"
2.92"
Drill Bits, Titanium-nitride (TiN) coated, R X 4 3/4"
Fractions
11/32"
0.3438"
4 3/4"
2.92"
Drill Bits, Titanium-nitride (TiN) coated, 11/32" X 4 3/4"
Letter
S
0.348"
4 7/8"
2.97"
Drill Bits, Titanium-nitride (TiN) coated, S X 4 7/8"
Letter
T
0.358"
4 7/8"
2.96"
Drill Bits, Titanium-nitride (TiN) coated, T X 4 7/8"
Fractions
23/64"
0.3594"
4 7/8"
2.96"
Drill Bits, Titanium-nitride (TiN) coated, 23/64" X 4 7/8"