At Fig. 364 four types of wall plugs are shown:a, the ordinary rectangular tapered wall plug to drive between the joints of the brickwork;b, the circular tapered wall plug as used to plug a wall after a star-shaped brick drill has been used;d, a twisted wall plug used for similar purposes to the wedgea, but consideredto be superior in holding power owing to its twisted formation;cis another type of wall plug considered to have great tenacity by reason of its corrugations. Wall plugs are required in nearly all cases where it is necessary to joint woodwork to brickwork, as, for instance, heavily-framed silvered mirrors to the walls of shops.

Fig. 364. - Wall Plugs, Four Varieties.