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6 pc. 4-1/8 In. I Letter Black Oxide Drill Bits
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BL4209
The Bosch line of metal drill bits offers a solution for every professional application. Each bit is manufactured to exacting specifications and features a split point that starts on contact with no walking or skating, eliminating the need for a center punch. Bosch black oxide bits offer superior durability, speed and selection to support most general-purpose applications.
Benefits
Speed helix design for three times faster drilling than standard bits
Available in jobber length, stubby length, extended length (aircraft), 1/2 In. reduced shank (Silver and Deming)
Last 50% longer than high-speed steel
For use in steel, copper, aluminum, brass, oak, maple, MDF, pine, PVC, polycarbonate, acrylic, ABS, nylon and composite materials
Easier drilling, reduced heat and extended drill bit life
Technical Data
| *Note | All 135° points; all round shank |
| Bulk | false |
| Diameter | I |
| Flute Length | 3.125 |
| Length | 4.125" |
| Overall Length | 4.125 |
| Quantity | 6 (bulk) |
| Shank Diameter | 0.272 |
BL4209
BL4209
BL4202
BL4208
BL4211
BL4214
BL4217
BL4218
BL4224
BL4225
BL4226
Other sizes
BL4224
Diameter
X
Overall Length
5.125
Quantity
6 (bulk)
Shank Diameter
0.397
*Note
All 135° points; all round shank
BL4225
Diameter
Y
Overall Length
5.25
Quantity
6 (bulk)
Shank Diameter
0.404
*Note
All 135° points; all round shank
BL4226
Diameter
Z
Overall Length
5.25
Quantity
6 (bulk)
Shank Diameter
0.412999
*Note
All 135° points; all round shank
BL4202
Diameter
B
Overall Length
4
Quantity
12 (bulk)
Shank Diameter
0.237998
*Note
All 135° points; all round shank
BL4208
Diameter
H
Overall Length
4.125
Quantity
6 (bulk)
Shank Diameter
0.266
*Note
All 135° points; all round shank
BL4211
Diameter
K
Overall Length
4.25
Quantity
6 (bulk)
Shank Diameter
0.281
*Note
All 135° points; all round shank
BL4214
Diameter
N
Overall Length
4.375
Quantity
6 (bulk)
Shank Diameter
0.301999
*Note
All 135° points; all round shank
BL4217
Diameter
Q
Overall Length
4.75
Quantity
6 (bulk)
Shank Diameter
0.332
*Note
All 135° points; all round shank
BL4218
Diameter
R
Overall Length
4.75
Quantity
6 (bulk)
Shank Diameter
0.339
*Note
All 135° points; all round shank