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Those RP designations are for ISC blocks. They must have gotten one hell of a buy on them. There's a bunch of ISC stuff rebranded on their website.

They really are. I've locked up two smaller pullies setting 2:1's with my winch. My little red Pinto has been bulletproof in this application.

These get used more than anything else. Thinking about a new 1/2" line for the summer. . .

ISC spring block. I've put more thought into this than a guy probably should. Let's use these two blocks as representative examples of all screw lock and spring locks, both by ISC. This is my main gripe with all screw lock blocks. The upper axle necks down for the threads, halving the...

ISC spring blocks in whatever size you like. Best there is. If you're going to set everything up around a 5/8" rope, consider a minimum 3/4" sling on both ends. You want to try and keep the rope itself as the weak link. When you're using a block in the tree the forces exerted on the sling...