Review by: phaedrus, 2004-05-31
Even though PMI says "The TRE is the only rope brake for double ropes that locks under stress," that's not quite accurate. The Hewbolt Double is specifically designed as an autolocking double rope rappel/belay device. These devices are designed to be used with UIAA 10-11 mm dynamic ropes.
Similar to the Hewbolt Single, this device can be used to belay a leader and makes a GREAT autolocking belay device. Personally, rappelling gives me the willies, and this device takes the edge off of that for me. It can be used with a single rope to belay with, and it fits a double rope for rappelling. Since it's an autolocker, a prussic is not needed if you're using this, though if you want, you can still use one- it just makes rapping down really slow.
I own one of each, the single and the double- both are excellent additions to my bag of tricks! This can even be used by the newest beginner or the crustiest expert.
Like the Hewbolt Single, this can be used equally well by either a left or right-handed person, which is another selling point for me (I'm left-handed.)