Not every job speaks metric. When the plans call for imperial, you need bits that actually match instead of getting close enough. This set gives you twenty-one high speed steel bits across the imperial sizes tradies reach for most, so you're not stuck rounding up or down and hoping it holds. HSS keeps its edge through wood, plastic and mild steel, which means the set is still doing its job long after the cheap versions have gone blunt. Grab the right size straight off the rack instead of second-guessing a worn label on an old bit. It saves time on site and saves you a trip back to the shed halfway through a job. There's a metric set alongside this one if that's what the next job calls for. Full specs are in the tabs below.