BIG BROS are light and compact spring-loaded, telescoping tube chocks which can be placed with one hand. Sturdy internal spring mechanism is released by an easy-access button, then a locking collar screws down to provide a solid, full strength placement. Any tug on the sling has a "camming" effect on the placement. BIG BROS are lightweight economical and solid in everything except extreme flared cracks. Smaller sizes will save weight and space on your every day rack and numbers 3-5 will gain you "new found" protection in offwidths and body packing chimneys. Check out the size of the #5 - redefining the upper end of today's protection range. Manufacturer's instructions for operation & care are included. Sling with 3-4' of 5.5 mm Titan Cord. Color anodized.