Heavy-Duty Anchor Bolt Fixing. Finish: Zinc Yellow Passivated. Tough And Reliable Construction. Four Way Expansion Shield Offering Strong And Secure Anchorage. Special Retaining Spring Ensures Encapsulation Of The Wedge During Expansion. Ideal For Fixing Racking Machinery Trunking Pipework And Switchgear. Also Suitable For External Applications Including Fencing And Joinery Structures. Suitable For Usewhere Fixtures Require Placing Over The Stud Which Include Wall Fixing Overhead And Ceiling Applications.socket Size Guide:m6 - 10Mm M8 - 15Mm M10 - 17Mm M12 - 19Mm.PTDFORDIR10PB880