RocarisRocaris 4 Pack M15 Lifting Single Pulley Block 304 Stainless Steel Crane Swivel Hook Double Pulley Roller Loading

Looks good. Wheels spin and pulley casing rotates as advertised, but the wheels are not on bearings -- they spin on a steel rod. That's OK, if there's no load on it. If only a moderate load is applied, the wheels don't spin, and the cord drags against the stationary wheels, wearing out the cord fairly quickly.

Tienes buena resistencia y son de buena calidad

These seem like they have decent quality. The first thing I needed to do was translate kilograms to pounds so I discovered these pulleys are supposed to handle 75kg or 165 pounds. Enough for small jobs. I am a bit skeptical of the attachment point strength - it seems to use a Phillips head screw which is obviously at a very shallow depth, so you may want to test this before lifting something expensive. A pulley is one of the "6 simple machines." Using only one pulley will not give you any mechanical advantage, but if you combine pulleys in a "block and tackle system" you can reduce your workload. I think using the two double pulleys here in a compound system you could lift a 100 pound weight with just 50 pounds of force. If my math is wrong feel free to let me know! Remember though - the attachment point must still be capable of supporting the full weight of - in this case - 100 pounds! I plan to use these with parachute cord rated for 550 pounds.

What can be said about such other than if they function and rate at all - and these do. They're lighter than expected, but that's okay as they're going in the camp gear. The weight limit is more than one would ever need for out on the landscape, a shop/garage use may warrant heavier ones, depending on. I'll probably be getting a 2nd set of these, they're good enough for the expense.

This is a nice little set of pulleys that can be used for a variety of needs. The quality seems pretty good but I'd say they are less finished looking than I expected. The wheels on the pulley do roll well and everything functions as it should.

Nice set of Stainless Steel M20 Swivels. I can use these outside in the weather and not worry about rust any time soon. They are strong enough to lift weight, roughly 165 pounds, so they take a lot for their size. The blocks do not break open so you have to run your lines through them. Havin two singles and two doubles, you can place them in a block situation to make lifting easier.

I've got a decent collection of pulleys, which I use around the house: lifting kayaks over my cars, lifting kayaks off the dock and into the water, lifting the top off an exercise pool, etc.  These pulleys measure up well with the others I've used over the years.   They're stainless, as advertised, and they're well built:  the shaft holding the wheel on each pulley has pronounced flattening on each end to prevent the shaft from pulling through the body of the pulley, the swivel rotates freely and looks solid despite the noted-by-others Philips screw, and the reinforcing bar welded across the bottom of the pulley is a nice addition for pulleys in this use and price range --it will keep the pulley from spreading apart if a too-thin rope gets lodged between the wheel and the body.     I have a fair amount of 5/16" nylon rope on hand and it fits well on these pulleys.  I wouldn't go any larger, and I wouldn't go much smaller than 3/16".   I've attached a photo of 5/16" line fed through these pulleys so you can see the fit.  When you place any sort of stress on the rope it sits right down in the track of the wheel.     They do squeak some.  A spot of oil fixes that issue.     I would not hesitate to use these pulleys in a situation where I'm hoisting 100 lbs or so.  They're built for it.

I set these pulleys up to my deck to raise my bike and some plants. Very easy to hang up and they were able to hold up my bike. So far no rust and the pulleys still run freely.