I purchased this last month for work. Used only once. 【Product Description】 The Unicender can be used in place of a friction hitch, figure eight descender, and ascender! In double rope technique, the Unicender can be used as a mechanical split tail in place of a friction hitch. It makes all rope climbing techniques easier and faster. In single rope technique, the Unicender functions as both an ascender and a descender. The Unicender can be used with 7/16 inch or 1/2 inch diameter lines without changing parts and can be easily installed mid-line. Morgan Thompson invented the Unicender in 2005. It quickly gained popularity for its unprecedented level of control and smoothness of ascent and descent. Rock Exotica's acquisition of the Unicender's manufacturing has made it possible to offer this incredible mechanical friction hitch at a fraction of the previous cost. ASC144