Strange thing to sell but having a tidy out of the cupboard, these are left over from when we put windows in, might suit someone.
100 MASONRY WINDOW FRAME CONCRETE SCREWS
7.5mm X 80mm
A one piece through fixing for securing frames to concrete, masonry and lightweight block. Torx drive, csk head with zinc & yellow passivated finish. A pilot drill of 6.0mm or 6.5mm is required