Bosch 2608580804 HSS Electricians Holesaw Set 9 Piece 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. Features: 9 piece holesaw set For the toughest demands Quickly and steadily through a wide variety of materials Designed to cut metal, mild steel, aluminium, plastic and plasterboard Progressive tooth strip for high cutting performace and fast chip clearance HSS bi-metal with 8% cobalt alloy for extreme resilience and long lifetime Specification: 1 x 20mm ( 25/32 Inch ) HSS Holesaw 1 x 25mm ( 1 Inch ) HSS Holesaw 1 x 32mm ( 1 1/4 Inch ) HSS Holesaw 1 x 38mm ( 1 1/2 Inch ) HSS Holesaw 1 x 5