Rock Exotica made in the USA machined pulleys are milled from solid 7075 aluminum so we can take material away where it's not needed and leave it where it is. The axle is machined as part of the side plate, allowing us to use a flush head axle screw. That's why these pulleys are more compact, stronger and lighter weight than conventional stamped pulleys. Weight: 2.9 oz (83 gm) Size: 2 1/2" inch wide x 4" inch tall x 3/4" deep Breaking Strength: 2 x 15 kN=30 kN Working Load: 2 x 2.5kN=5 kN Max Rope: 11 mm Sheave Diameter: 1.1” (21 mm) Certification: CE, UIAA