Wire nails are available in ___ shape.

The length of a spike is _____

The figure below represents __

A _______ joint is formed by making projections and corresponding depression on the other piece.

The hazard which concerns with the loss or damage to life is referred to as the __________

The figure below represents ___

The class of fire-load not exceeding 1.15×10^6 is considered as _____

________________ are the pieces of wrought iron or cast iron and are used to protect the ends of timber.