Features:<br> <br> <br> Straight shank design is more suitable for many electric drills and drilling machines(here is not included)<br> <br> <br> Sharp and twisted flute will make the drilling be more easy and effortless<br> <br> <br> Suitable for wood, aluminum, plastic, etc<br> <br> <br> <br> Specification:<br> 100% new and high quality<br> Product Name: Twist Drill Bit<br> Design: Straight Shank<br> Material: HSS<br> Diameter and total length:<br> <br> 4mm Twist bit, 200mm total length<br> <br> <br> <br> <br> <br> Package include:<br> 4 x Twist Drill Bit<br> .wang-edit-text{<br> font-family:'Arial'<br> important;<br> }<br> .wang-edit-text table {<br> border-top: 1px solid<br> 000;<br> border-left: 1px solid<br> 000;<br> }<br> .wang-edit-text table td,<br> .wang-edit-text table th {<br> border-bottom: 1px solid<br> 000;<br> border-right: 1px solid<br> 000;<br> padding: 3px 5px;<br> }<br> .wang-edit-text table th {<br> text-align: center;<br> } 1The twist drillare made from premium high speed steel for increased durability. 2Bit has a straight shank, which is more convenient to operate. Milled flutes with deep cut spiral that delivers fast material removal. The flutes of the drill bit act a passageway for chip extraction from the hole and for coolant to enter the hole. 3This finish gives a strongly adhering surface treatment that acts to retain cutting fluid and prevent chip to tool welding, reducing the formation of a built-up edge. 4Drilling, or hole making, is the most common metalworking operation in the world. Twist drill bits are the most common type of drill bit used. Twist drill bits are commonly used to drill holes with hand operated drills, standalone drill presses, or lathes. 5This product is designed for impact applications, for fast drilling in block, masonry and concrete, ect.