(Pack of 4) Shaft Collar Set for Linear Rail SBR12, All in One Clamp-on Shaft Collar with M4 Set Screw, Bore 12mm, OD 30mm, Thickness 10mm

Perfect fit on my linear rails. Very easy to install and works as designed. Love the product and price.

Great product

Provide a good solid mechanical stop on my 16mm rails. Easy to install.

Stops work well but would be nice if came with sized Allen wrench but they work well for intended purpose

I thought I could get by without these. Nah. Notta. No way. I caught my sled about twenty times trying to fall off the rails. Just spend the money and get the lock collars.

Does what it was made to do at a fair price

Fit perfect on my router sled.

These work great on my router sled for manual stops. My only criticism would be that when you tighten the screws they tend to make a divot in the rail bases, so micro adjustments after those divots are in place become more difficult. But this may be due to the softness of the rail base metal, not a failure of these stops.

Excellent qualities..fits perfectly on various linear guide rails 👍

Son de buen material y se ajustan perfectamente en el riel de 20 mm.

I filed smooth the mating ends of the securing 4mm screws so they don’t grab and misalign the stop position when fully tightened but they are accurate in size and work as intended.