I'm fully obsessed with a slotted cutting board I discovered in France earlier this year, and I recently learned you can buy one on Amazon for just $11.

As screw production increased, slotted drives became standard. But if you’ve ever cammed (slipped) a screw-head slot, you know why it’s not the only design.

Used primarily as safety nuts, these nuts are slotted to receive a cotter pin or wire which passes through a drilled hole in the bolt and locks it. In assembly the nuts are torqued to preload ...