The Gibbs 4S bolt Ascender . Not for self belay by solo climbers. Designed not to slip on iced and muddy ropes. Their simple, durable construction makes them almost foolproof. They are easy to assemble on the rope, yet will not slip unexpectedly. They can be rigged in all the standard methods for mechanical prusiks.

• MODEL #4SB
• 5/8" to 3/4" ropes
• 14mm-19mm
• Spring-loaded
• Stainless steel shell
• Breaking weight: 5650lbs