This unique tiny personal ascender device is a perfect aid for rope ascent and any type of pulling rope. It is placed like a ring on the middle finger and provides extra grip and strength during dragging and hauling operations for highest efficiency. For rope diameters from 8 to 13 mm. The finger slot is equipped with a spring that provides stability while in use. The spring opens immediately if the finger gets caught. Made of 100 % stainless steel. Suitable for rope diameters from 8.0 to 13 mm.