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

1 inch steel collars with hex/ allen wrench screw. Fantastic collars. I originally bought four for two of my weight dumbbells. I just bought eight more for some of my other 1 inch weight dumbbells. Great quality. Tightened the screw with an allen wrench I had and it feels very tight. Perfect fit. Dont make the same mistake I did and buy those cheap plastic 1 inch collars. Instead by the solid steel 1 inch collars. The picture has an example of the cheap plastic ones that you dont want to buy. In the picture I also left the twist collar on too only because I had room but I would feel very comfortable just to put this collar on if I ran out of room on the bar.

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

We use these on a lot of different type jobs

These are great BUT, they are 5/16 24 and NOT 5/16 18.

I used it for my 1-in diameter dumbbell set. It worked perfectly. And you cant beat the price.

using to be a stop point for a tool rest on my lathe. plenty of space but no slop. not a machinist fit but not that it is needed for the application.

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

Used for a shop made spinning drum to drag the lawn and make it level.

Good price & quality

Excellent product well-made works perfect!