24Kn 4inch spring loaded closure Made of quality aluminum material, high strength, good toughness, durable.  Tight fit, small clearance, high elasticity, safe to use with tie down straps. 

These are sewn loop runners with material made by Sterling Rope.
Inside loop measurement is 48in , 36in and 24in
• 4,000 lb break strength
• 1in width tubular webbing
• Stitching for consistent and dependable stitches.
• Two colors and  three lengths to choose from.

Available in colors; Red and Black

WARNING - These tie downs are make for kites and should not be used for
human hanging usage like rock climbing , rescue,  auto towing, crane material lifting or other activities utilizing human strapping. They have not been certified for other activities. 

21-1120 Heavy Duty
Pulley Material:Aluminum
Height: 8.2 cm / 3.23 in
Width: 4.4 cm / 1.74 in
Length: 2.9 cm / 1.15 in
A Hole Size: 13 mm / 1.27 in ( Will Take 9.25 mm - 12 mm Rope Or Small )
Closed Strength: 4500 lbs / 20 KN
Color: Red
Net Weight: 86.5 g / 3.05 Oz
Carabiner  Aluminium Alloy (Anodized)
Heavy Duty Padded Strap Color Random

21-1121 Standard Walk Down
Includes Pulley, and Strap
ideal for line 1100lb and under