75 mm coach bolt screws,10mm dia.Into wall studs and thru floor into joist or blocks of timber under floor.I got a pass for doing this in chch few years ago.Put a big dob of fibar glass glue around hex bolt head.Goes really hard and bitch for thiefs to grind off to get socket over hex bolt head.Do this to about half your bolts heads.Im a expert.lols
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