A lightweight,full-strength Prussik minding pulley ideal for mountain rescue,swift water rescue,or other technical applications where equipment weight is a significant consideration. RESCUE PULLEY FEATURES: Machined side plates vary in thickness to maximize strength-to-weight ratio. High-eficiency sealed ball bearings. Aluminum side plates protect rope. Extremely low-profile stainless steel axle assembly. Compact design reduces snagging on uneven surfaces. Designed for use with up to 13 mm diameter lifeline.