The new SMC CRx (Crevasse Rescue) Pulley is a full featured pulley specifically designed to be diminutive in size and weight, yet extremely strong and efficient. This new pulley is ideal for use in a 2-to-1 C-system or as a 3-to-1 Z-system and includes prusik minding capability. Ideal for rescue use by those who demand the lightest, strongest pulley available. Easy to use and easy to carry, this pulley also has color-contrasting aluminum rotating side plates for simple rope insertion and removal. -Made from high quality aluminum -Anodized side plates help prevent corrosion Supports rope diameters up to A 1/2 inch (13mm) -Stainless steel rivet axle -Nylon sheave -Made in the USA Type: Single Pulley MBS: 22 kN (5000 lbf) Weight: 1.8 oz (52 g) Length: 2.70" (6.9 cm) Width: 1.75" (4.4 cm) Height: 1.07" (2.7 cm) Axle: Stainless Steel Rivet Sheave: 1.20" Nylon Tread: 0.83" Max Rope Size: 13 mm Material: Aluminum