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USSpars produces three different block sizes. Listed below are the specifications of each size and a link to view them.

Block Size 1

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Sheave breaking load 1100 kg Sheave diameter 45 mm
Sheave working load 550 kg Maximum rope diameter 12 mm

Block Size 2

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Sheave breaking load 1800 kg Sheave diameter 60 mm
Sheave working load 900 kg Maximum rope diameter 14 mm

Block Size 3

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Sheave breaking load 2600 kg Sheave diameter 80 mm
Sheave working load 1300 kg Maximum rope diameter 16 mm