Thank you for viewing. I used it only once, passing a rope through it. It didn't fit my climbing system. Purchased from the Buckingham website (USA). Description The Buckingham Throttle is one of the most exciting arborist climbing devices 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 - 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 axles 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 The Buckingham Throttle is a very smooth tending device in both MRS and SRS modes, allowing you to switch climbing styles with a few button operations. Every part of the Throttle is designed with ease of use in mind. You can adjust the rope friction with a few button operations, and it also has oversized attachment holes that can accommodate your favorite carabiners. Arborist Akimbo