Hammerscrew Designed To Work In Both Solid And Hollow Substrates - Concrete, Stone, Solid Block And Solid Brick. By Hammering In The Fixing, The Drive Nail Pushes Against The Pre-Expansion Collar Until The Sleeve Is Fully Located. Further Hammering Or Tightening The Screw Causes The Sleeve To Expand. When Point Of Contact Is Made In The Hole The Screw Is Drawn In Towards The Fixing Until Flush With The Fixture Surface.
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