The STAS smartspring can carry loads up to 4kg (8.8 lbs), when used in combination with a STAS cobra + perlon cord. The dimensions of the STAS smartspring are: 22,5mm (0,89″) high x 11mm (0,43″) wide. depth of the hook part is 4mm height of hook part is 6mm Warning: product price is for a smartspring only. Use with perlon cord with loop, glider or cobra cords. Not suitable for use with the steel cable.