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Item # Diameter
Overall
Length
Shank
Diameter Quantity
Carded Items
CO2131 1/16" 1-7/8" 1/16" 1
CO2132 5/64" 2" 5/64" 1
CO2133 3/32" 2-1/4" 3/32" 1
CO2134 7/64" 2-5/8" 7/64" 1
CO2135 1/8" 2-3/4" 1/8" 1
CO2136 9/64" 2-7/8" 9/64" 1
CO2137 5/32" 3-1/8" 5/32" 1
CO2138 11/64" 3-1/4" 11/64" 1
CO2139 3/16" 3-1/2" 3/16" 1
CO2140 13/64" 3-5/8" 13/64" 1
CO2141 7/32" 3-3/4" 7/32" 1
CO2142 15/64" 3-7/8" 15/64" 1
CO2143 1/4" 4" 1/4" 1
CO2144 17/64" 4-1/8" 17/64" 1
CO2145 9/32" 4-1/4" 9/32" 1
CO2146 19/64" 4-3/8" 19/64" 1
CO2147 5/16" 4-1/2" 5/16" 1
CO2148 21/64" 4-5/8" 21/64" 1
CO2149 11/32" 4-3/4" 11/32" 1
CO2150 23/64" 4-7/8" 23/64" 1
CO2151 3/8" 5" 3/8" 1
CO2152 25/64" 5-1/8" 25/64" 1
CO2153 13/32" 5-1/4" 13/32" 1
CO2154 27/64" 5-3/8" 27/64" 1
CO2155 7/16" 5-1/2" 7/16" 1
CO2156 29/64" 5-5/8" 29/64" 1
CO2157 15/32" 5-3/4" 15/32" 1
CO2158 31/64" 5-7/8" 31/64" 1
CO2159 1/2" 6" 1/2" 1
Bulk Items
CO4128 1/64" 3/4" 1/64" 12
CO4129 1/32" 1-3/8" 1/32" 12
CO4130 3/64" 1-3/4" 3/64" 12
CO4131 1/16" 1-7/8" 1/16" 12
CO4132 5/64" 2" 5/64" 12
CO4133 3/32" 2-1/4" 3/32" 12
CO4134 7/64" 2-5/8" 7/64" 12
CO4135 1/8" 2-3/4" 1/8" 12
CO4136 9/64" 2-7/8" 9/64" 12
CO4137 5/32" 3-1/8" 5/32" 12
CO4138 11/64" 3-1/4" 11/64" 12
CO4139 3/16" 3-1/2" 3/16" 12
CO4140 13/64" 3-5/8" 13/64" 12
CO4141 7/32" 3-3/4" 7/32" 12
CO4142 15/64" 3-7/8" 15/64" 12
CO4143 1/4" 4" 1/4" 12
CO4144 17/64" 4-1/8" 17/64" 6
CO4145 9/32" 4-1/4" 9/32" 6
CO4146 19/64" 4-3/8" 19/64" 6
CO4147 5/16" 4-1/2" 5/16" 6
CO4148 21/64" 4-5/8" 21/64" 6
CO4149 11/32" 4-3/4" 11/32" 6
CO4150 23/64" 4-7/8" 23/64" 6
CO4151 3/8" 5" 3/8" 6
CO4152 25/64" 5-1/8" 25/64" 6
CO4153 13/32" 5-1/4" 13/32" 6
CO4154 27/64" 5-3/8" 27/64" 6
CO4155 7/16" 5-1/2" 7/16" 6
CO4156 29/64" 5-5/8" 29/64" 6
CO4157 15/32" 5-3/4" 15/32" 6
CO4158 31/64" 5-7/8" 31/64" 6
CO4159 1/2" 6" 1/2" 6
Cobalt Drill Bits
Cobalt Drill Bit Sets
Bosch cobalt drill bits offer the best heat resistance and rigid thick web design for
drilling in extremely hard and abrasive materials such as treated stainless steel
(precipitation-hardened), cast iron and titanium.
• A tough cobalt alloy delivers heat resistance up to 1100° Fahrenheit allowing
the bit to perform for extended periods of time in the most abrasive materials
without failing due to the high heat levels. Overall bit hardness of 66-68 HRC from
the cobalt formulation gives the ability to penetrate exceptionally tough materials
• 135° split point starts on contact with no walking or skating and no center
punch is required
CO18
CO4029
Item # # of Pieces Description
CO10 10 10 pc. set in blow-molded plastic case
CO4013 13
Fractional jobber length 1/16" to 1/4" by
64ths in metal index
CO18 18 18 pc. set in blow-molded plastic case
CO4029 29
Fractional jobber length 1/16" to 1/2" by
64ths in metal index
Item #
Chuck
Size# Rating
Bit
Capacity Mount Application
CKK002 3/8" Heavy 1/16" - 3/8" 3/8" - 24
Fits all brands
of cordless and
corded drills.
CKK003 3/8" Extra-Heavy 1/16" - 3/8" 3/8" - 24
Fits all brands
of cordless and
corded drills and
hammer drills.
CKK004 3/8" Heavy 1/16" - 3/8" 1/2" - 20
CKK005 1/2" Heavy 5/64" - 1/2" 1/2" - 20
Reversible Geared Three-Jaw Chuck Kits
• Kits include: chuck key; metric and standard
mounting screws – coated and hardened and
complete instructions.
Metal Drilling