Cable adjusters are square. For decades now, bottom-bracket spindles have had square ends and cranks have had square holes. Seat-post clamps also have square holes and the clamp bolts have square necks.

And then you go to mount a chainring on a crank, and round sleeve nuts spin around in round holes.

It is possible to play tricks with lubrication, but really, isn't it about time that someone solved this problem for real?

Introducing ShelBroCo QuadraTech Chainrings and Non-Rotation sleeve nuts

Why didn't anyone think of this before? It's so simple! Square bolt holes, square-headed sleeve nuts. Finally, no more annoying slip and spin.

This changes everything!

Testimonials

"The square is to us what the cross was to the early Christians"

Theo von Doesburg

"You're so square."

Jerry Leiber and Mike Stoller

"I'll never turn back upon my track until I get a square."

Harry "Mac" McClintock

"Oh, a day in the city-square, there is no such pleasure in life!"

Elizabeth Barrett Browning

*Guaranteed for the life of the user, or two weeks, whichever comes first. Void where prohibited, prohibited where void, keep away from children and animals, use only with adequate ventilation. Attempt to insert a square nut in a round hole or a round nut in a square hole voids warranty. Note: Misuse of this product may lead to death or even serious injury!