Climax Metal C-100 Shaft Collar, Zinc Plated Steel, Set Screw Style, One Piece, 1 Bore, 1-1/2 OD, 5/8 Wide, With 5/16-18 Set Screw

Very convenient, useful, reliable

Set screw is NOT 5/16-18, its 5/16-24... at least the one they sent me. Probably doesnt matter to many, but I planned to replace the set screw with a threaded knob, so my project is now delayed while I either find a replacement or tap a new hole in this one.

Been using this for home gym barbells (10-15lb weight per side) as a more stable substitute for the elastic bands I previously used and have had no issues. The diameter was exactly as described and the collars have held with no loosening after a few dozen weightlifting sessions. Granted I keep the barbell level to the ground pretty much the majority of the time, the collars have not shifted any noticable amount after a fair amount of pressure on them over the past few weeks.

Good price & quality

WTF Amazon? To be fair, this is a review of Amazon. This item, sure it was less than $2, but still, it should have been new. Plastic bag was torn open the item was dirty and used, that set screw needed to be replaced because the head was stripped out. Not worth my time replacing. I did receive another a few days earlier and it was fine.

Use them to keep the wheels close together on the sides from my hand card

I keep thee around great for many uses around the shop.

This worked exactly for what I needed. The items arrived quickly and were 1/2 the price of a local tractor store. They didnt have it in stock at the store anyway.

Installs easily

Inexpensive solution to threaded dumbbell handles that will not stay tight.