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Bosch Twist Drill Bits Black Oxide & Cobalt

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Bosch Cobalt Drill Bit (SELECT SIZE)


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  • Bosch
  • High red hardness of cobalt steel permits speeds 30% higher than regular high speed steel drill
  • Strong heat resistance and rigid thick web design allows for drilling in extremely hard and abrasive materials such as treated stainless steel (precipitation-hardened), cast iron and titanium.
Drill Bit


Drill Bit



Black Oxide Drill Bits
CO4128 - 1/64 x 3/4 x 1/64 [Add $1.50]

CO4129 - 1/32 x 1-3/8 x 1/32 [Add $1.37]

CO4130 - 3/64 x 1/4 x 3/64 [Add $1.20]

CO4131 - 1/16 x 1-7/8 [Add $1.17]

CO4132 - 5/64 x 2 x 5/64 [Add $1.17]

CO4133 - 3/32 x 2-1/4 x 3/32 [Add $1.17]

CO4134 - 7/64 x 2-5/8 x 7/64 [Add $1.23]

CO4135 - 1/8 x 2-3/4 x 1/8 [Add $1.49]

CO4136 - 9/64 x 2-7/8 x 9/64 [Add $1.59]

CO4137 - 5/32 x 3-1/8 x 5/32 [Add $1.68]

CO4138 - 11/64 x 3-1/4 x 11/64 [Add $1.77]

CO4139 - 3/16 x 3-1/2 x 3/16 [Add $2.04]

CO4140 - 13/64 x 3-5/8 x 13/64 [Add $2.61]

CO4141 - 7/32 x 3-3/4 x 7/32 [Add $2.79]

CO4142 - 15/64 x 3-7/8 x 15/64 [Add $3.03]

CO4143 - 1/4 x 4 x 1/4 [Add $3.36]

CO4144 - 17/64 x 4-1/8 x 17/64 [Add $3.60]

CO4145 - 9/32 x 4-1/4 x 9/32 [Add $3.90]

CO4146 - 19/64 x 4-3/8 x 19/64 [Add $4.56]

CO4147 - 5/16 x 4-1/2 x 5/16 [Add $4.89]

CO4148 - 21/64 x 4-5/8 x 21/64 [Add $5.30]

CO4149 - 11/32 x 4-3/4 x 11/32 [Add $6.21]

CO4150 - 23/64 x 4-7/8 x 23/64 [Add $7.07]

CO4151 - 3/8 x 5 x 3/8 [Add $7.41]

CO4152 - 25/64 x 4-7/8 x 25/64 [Add $7.74]

CO4153 - 13/32 x 5-1/4 x 13/32 [Add $8.23]

CO4154 - 27/64 x 5-3/8 x 27/64 [Add $8.75]

CO4155 - 7/16 x 5-1/2 x 7/16 [Add $9.09]

CO4156 - 29/64 x 5-5/8 x 29/64 [Add $10.93]

CO4157 - 15/32 x 5-3/4 x 15/32 [Add $11.13]

CO4158 - 31/64 x 5-7/8 x 31/ [Add $11.43]

CO4159 - 1/2 x 6 x 1/2 [Add $11.78]

Summary
Base Price: $0.00
Customized Price: $0.00
Quantity: