Buckingham Throttle Special Felling Arborist I used it for a day at a training session to compare devices. I don't plan to use it in the future, so I'm putting it up for sale. There are a few scratches, but the condition is very good. Please purchase if you understand that this is a used item. used Description The Buckingham Throttle is one of the most exciting climbing devices for arborists in recent years! Arguably the most user-friendly ascender, the Buckingham Throttle can be attached mid-line and allows for quick and easy switching between MRS and SRS functions. Details Rope diameter: 11mm to 13mm Maximum user weight: 310 lbs (approx. 135kg) Weight: 535g (approx. 1.18 lbs) Easy-to-use locking opening Parts won't fall out when opened Hollow shaft for upper and lower connection points Quick and easy switching between SRS and MRS modes Easy adjustment without tools Mid-line attachment possible Sturdy auxiliary attachment point