○ This belay device with brake assist function is designed for use in both gyms and on rock, for experienced belayers. ○ Compatible with single ropes from 8.5 to 11 mm. ○ The brake assist function provides high operability during belaying, hanging dogging, and stopping falls. ○ The handle releases the cam lock, allowing for excellent descent control. ○ Weight: 175 g ○ Rope compatibility: Single ropes with a diameter of 8.5 to 11 mm ○ Materials: Aluminum (side plates), stainless steel (cam, friction plate), reinforced nylon (handle) ○ Proper training is required before use. My father bought this for mountain work, but he didn't use it due to his age and injuries. I have never used it either, so please consider it as used. No claims and no returns accepted. Thank you for viewing.