I'm looking a wall plug that can a 4mm x 39 mm screw (1 & 1/2'' number 8 in old money!)
Thanks for you enquiry,
The Red plug is 30mm in length, so the screw length required will be: the thickness of the item you are fixing + 30mm (plug length) + 4mm or 5mm protrusion (screw Ø). The hole in the substrate will need to be 40mm deep, leaving you a 5mm or 6mm gap at the bottom.
Date published: 2016-11-27