dashan drlling screws

     Screw is an incline of physics and mathematics principle of circular rotation and friction, fastening step by step implements part of the tool.Drlling screw is front end has a self tapping screw drilling head wood screw.
<span rgb(**2,="" **2,="" **2);="" font-family:="" tahoma,="" arial,="" 宋体,="" \'malgun="" gothic\';="" font-size:="" *2px;="" line-height:="" *4px;="" text-align:="" justify;="" widows:="" auto;="" background-color:="" rgba(**5,="" **5,="" 0.8);\"="" style="margin: 0px; padding: 0px; list-style: none;">      Dashan company produces the drlling screw by customer praise, welcome new and old customers to come to inquiry.