ACEM products appear to have been made from a cement compound and as such are heavy. Made by A.C.E.M of Nottingham, and distributed by Edward Exley Ltd of Baslow.
 
Tunnel portal described as measuring approximately 9 3/8 inches high by 7 1/4 inches wide and 1 inch thick. The portal gap is 4 1/8 inches  | 

 
Another ACEM portal, with walling  | 
 
ACEM retaining walls, approx. 10 x 6 inches  | 

 
ACEM Tunnel Portal and Retaining (Wing) Walls  | 
 
ACEM Tunnel Portal and Retaining (Wing) Walls  | 
 
ACEM Tunnel Portal and Retaining (Wing) Walls  | 
 
ACEM Tunnel Portal and Retaining (Wing) Walls  | 
 
ACEM Tunnel Portal and Retaining (Wing) Walls  | 
 
ACEM Tunnel Portal and Retaining (Wing) Walls  | 
 
ACEM Tunnel Portal and Retaining (Wing) Walls  | 
 
ACEM Tunnel Portal and Retaining (Wing) Walls  | 
 
ACEM Tunnel Portal and Retaining (Wing) Walls  | 

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