35 KN Climbing Rescue Figure 8 Descender Rigging Plate Heavy Duty & Large & High Strength Rappel Device Equipment for Rappelling, Belaying, Tree Climbing, Aerial Silks Rigging, Red - Walmart.com
CMC Rescue 8 - Rescue Response Gear
Buy Big 8 Stainless Steel Rescue Descender by Pro-Climb | Quality Gear For Arborist | Gap Arborist Supply
Figure 8 Safety Hint from back-in-the-day
Using a figure 8 for descending the tree - WesSpur's Niceguydave demonstrates a classic tool - YouTube