The Superlec 663KB Galvanised Adaptable Knockout Box is used to extend or repair electrical circuits.
The main features of the 663KB are:
4 Optional 20mm knockouts per side
Manufactured from 1.2mm pre galv steel
Comes complete with flanged cover and 4 fixing screws
BS EN 50142 & 3
Dimensions: (H) 150mm x (W) 150mm x (D) 75mm