Here's what other sites are saying:
Tweeked and tuned to perfection this generation of WALL LADDERS have made it up some of the hardest aid routes in the world.
Speed Wall Ladders by Yates are designed with the same configuration as the Big Wall Ladders but have 1in. wide steps to reduce bulk and weight. Smaller diameter spreader bar!! Speed Wall Ladders compliment Yates Big Wall Ladders to use as a third or fourth ladder set. Built in spreader bar insures that steps remain open without causing foot pinching. 6 Step Speed Wall Ladder measures 70in..
Yates 6 Step Big Wall Ladder
Yates Speed Stirrup
Black Diamond Dynex Daisy Chain
$22 - $35
Metolius 5 Step Aider
$30 - $35
Black Diamond Etrier
$28 - $38
Grivel Belay Daisy Chain