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Bosch has released this new high speed steel holesaw set specifically for Electricians. It features the sizes they use every day and come in a sturdy plastic carry case. HSS Bi-Metal With 8% cobalt alloy for extreme resilience and long lifetime. For Drilling in steel and cast iron, structural steel, alloyed and unalloyed aluminium, bronze, copper, PVC, acrylic glass and wood. The cutting quality depends on the correct speed and the coolant used.