I acquired my North Safety Products Saf-T-Climb on eBay in 2009.
The Air Space Devices Saf-T-climb is 164 mm. tall, 99 mm. wide, and 77 mm. thick, and weighs 1702 g.
This heavy device is a safety that works on a notched pipe that would be permanently fixed beside a ladder. It is obviously closely related to the Air Space Devices Saf-T-Climb, but it omits the lower guide and second hook found on the Air Space Devices. That saves some weight, but the larger top hook reduces the weight savings