The Makita Performance HSS Bi-Metal Hole Saw in 20mm diameter is a commonly specified size for conduit and cable management work, performing reliably across metals, plastics, and board. Features and Benefits: • HSS Bi-Metal with 5% cobalt for durability and extended life • Variable pitch 4 TPI tooth for smooth cutting • Suitable for wood, gypsum board, plastics, non-ferrous metals, aluminium, steel and stainless steel • Compatible with hex and SDS adaptors Specifications: Diameter: 20mm Arbor Part Number: P-35156 / P-35178 Pack Quantity: 1