At this rate, Kogan is sending me broke… I bought a spare set…
These step drill bits are the " bee's knees" of drill bits…can't go wrong for $9.99 with a nice carry case.
From Kogan website:
Drill holes through brass, steel, wood and plastic with ease thanks to this 5 piece drill bit set, built with an easy-drill incremental step design that gives you an accurate drill for 50 different hole sizes.
Suitable for drilling steel, brass, wood and plastic
5 Bit HSS steel set with 50 different steps (10, 12, 9, 13, 6)
Easy to use and accurate incremental fixed drilling steps
2 Flute design clears away particles and materials for a cleaner drilling area
3 Sided shank fits securely into the chuck for greater safety and grip
Compatible with the Certa Power Tools range and most drills
Drill the right hole size for the job with the all-in-one Certa 5 Piece Step Drill Bit Set, featuring 50 fixed incremental steps over 5 drill bit pieces to help you drill through most materials with better precision – a must-have for any tradesperson or DIY enthusiast!
2 Flute design
No need to clear out excess waste, particles and materials while you’re on the job with the two flute design, allowing particles to escape easily for more seamless and continuous drilling.
Greater grip, traction and safety
Get peace of mind for your safety with the three-sided shank, fitting securely into the chuck to prevent any drill slip while providing greater traction and grip to the drill.
problem is it is imperial