A development of the very successful type H gripper jaw, the BF offers the same power but for smaller diameters. Optimum sizes are 36mm externally and 20mm internally with the internal serrated grip opening out to give unrivalled gripping power on spigots. Recommended range: 15-35mm internal, 30-50mm external.
N.B. The finish may be either silver or black due to changes in legislation regarding passive zinc plating.