In appearance it resembles a miniature corrugated galvanised sheet such as is used for roofing purposes, with the exception, however, that the corrugations are divergent instead of being parallel and that one end is ground down to a cutting edge (see , A). They are made in various sizes from 1&f
Fig. 362.—Jointing Boards.
Fig. 363.—Jointing a Frame.
The Use of Saw-edge Corrugated Steel Fasteners.
To use the fastener no special tools are required; it is simply driven in with a hammer exactly as though it were a nail; once in position, however, to get it out is worse than drawing teeth. The corrugations add to the strength of the device, the wood fibres closing around them, age and rust but emphasising their grip.