GM CLIMBING GM CLIMBING 20kN UIAA Certified Black Micro Prusik Minding Pulley 1/2" (Pack of 2(Black))

Bought these to use on a BWCA camping trip to lift food packs off the ground for bear prevention. We had about 90 lbs in two packs that we lashed together. We used three pulleys, and one person was easily able to lift the packs and tie them off. While 90 lbs isn't a great stress test, the wheels all rolled well and gave us the mechanical advantage we were looking for so we didn't have to resort to herculean efforts or unsafe conditions to try and push up the packs from underneath. It was definitely more of an investment in these than in many cheaper sheet-metal pulleys with no bearings, but they should last a lifetime for this kind of light-duty work. I used 550 paracord with them with no issues at all. Definitely like the design to open them up and add a pulley anywhere along the rope, too.

Solid pulley was a little smaller than excepted, gets the job done though for safety lines

Got these today. As others note, they’re wider between the side plates than you’d expect — I can see why they wouldn’t work great for minding small prusiks. Biggest thing is they really aren’t that smooth or efficient. I rigged two of them in a system with no mechanical advantage (just redirects). To lift a test weight of 26lbs took 43lbs of pull, so 60% combined efficiency for the two pulleys, or something like 77% for each. The same setup using two of the GM climbing small double-sheave pulleys (two parallel lines) required only 33lbs pull — noticeably smoother pulleys that do seem to have ball bearings. I think these are going to be too inefficient to keep.

These are really well made at an affordable price. I got two of their 30kN pulleys and their rigging plate as well, all excellent stuff. I only have 8mm rope and a prusick slips through this as it's for larger rope. No problem for me as I don't intend to use prusicks. The way the brass bearings are made keeps the roller centered. Shipping was fast. All in all a very good product, I'm a happy camper.I don't know why they are called micro as they are a good decent size not some tiny things.

I purchased these to use with a cable pulley (spud inc) system on my home gym. The problem with these is that they don’t swivel, making them useless for my purpose.I knocked a star off because the motion isn’t that smooth.