I've been using the Kong Slyde for a couple of years now. I personally use it on my tether. I two tether climb and it's worked great for me. Easy to adjust with one hand, once weighted it is solid. Good for 9-10mm rope. All aluminum, rated for 2500kg. I use some shrink tube and a couple castration bands to keep it quite on the carabiner. Doesn't make a sound. Just thought I'd share.
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