Blue Spot Tools 20501 Step Drill 4 32mm Set with Wallet (3 Pieces)

Amazon

Specially designed for precision drilling of holes in aluminium, brass, copper, plastic, steel and wood Manufactured from high speed steel for increased durability and cutting power Titanium coated to reduce friction and heat Includes handy nylon wallet for quick and convenient storage Suitable for use with most drills, Manufacturer: Blue Spot Tools

Zoro Tools

The BlueSpot 3 Piece 4mm - 32mm HSS Step Drill Set With Wallet is specially designed for precision drilling of holes in aluminium, brass, copper, plastic, steel and wood. Manufactured from high steel for increased durability and cutting power. Titanium coated to reduce friction and heat. 2mm step increments. Suitable for use with most drills.

ManoMano

Blue Spot Tools 3 Piece Hex Shank HSS Step Drill Set (4 - 32MM)