High Speed Steel Drill Bits

StrongArm Thunder Bits


We now have the very high quality, High Speed Steel Thunder Bits in stock. Special safe drilling sizes provide clearance for carbide tip drills and diamond core drills. The slight oversize for 1/4, 5/16 & 3/8 in the mild steel hole helps remove the shavings and drills run cooler, with less side friction and last longer.

1/4" carbide or diamond core, use 9/32"

 9/32 x 4 1/4" $4.75

5/16" use 11/32"

 11/32 x 4 3/4" $6.50

3/8" use 13/32"

 13/32 x 5 1/4" $8.50



LongArm Drill Bits
High Speed LongArm Drill Bits

 1/4 X 12 $8.00

 1/4 X 18 $18.00

 1/4 X 24 $14.00

 5/16 X 12 $10.00

 5/16 X 18 $13.00

 5/16 X 24 $16.00

 3/8 X 12 $12.00

 3/8 X 18 $15.00

 3/8 X 24 $18.00

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