Stephen wrote:

Are there any left handed tools? I realise 90% of people are
right-handed but if 10% of the global population are left handed,
isn't that big enough to make a market?

Quite so. Just think of the fortune there is to be made in selling
left handed screwdrivers, chisels, hammers, pencils, spades, forks,
teaspoons, and mugs.