Harken HK432 Pivoting Cheek Air Block

This 16mm block offers a very high working load in an extremely small, lightweight block. It is perfect for smaller synthetic control lines found on high-tech dinghies. Key features include stainless steel sideplates and stainless steel balls in grooved race. Max line dia. 5 mm.
http://www.harken.com.au/productcategory.aspx?taxid=4837
Sheave: 16mm
Length: 35mm
Weight: 11g
Max line: 5mm
Safe working load: 113kg
Breaking strength: 339kg