U.S. Tsubaki Wrench chains have extra long pins extending beyond both sides of the chain. They serve as tension linkages for holding pipes securely in pipe wrenches.
Wrench Chains
Wrench Chain-2
Unit of Measure
1 

Item #

P - Pitch

Lacing 

D

L

E

T

50WRENCH N/A 0.625 in N/A 2x2 N/A 0.200 in N/A 0.559 in N/A 0.114 in N/A 0.080 in
60WRENCH N/A 0.750 in N/A 2x2 N/A 0.234 in N/A 0.787 in N/A 0.197 in N/A 0.094 in
Unit of Measure
1