{HEAD ~ Extension sets} in {TAIL ~ accordance} with the present invention can be freely used in difficult working environments, for example, a carpenters workshop, a building site, and the like, and are designed not to leave residual marks as may be left when using the extension set illustrated and described in US Patent Application Publication 
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{ HEAD ~ Extension sets } in { TAIL ~ accordance } with the present invention can be freely used in difficult working environments , for example , a carpenters workshop , a building site , and the like , and are designed not to leave residual marks as may be left when using the extension set illustrated and described in US Patent Application Publication
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