1、Drill bit is made from carbon steel and countersink is made from good quality 45# steel which ensures a long service life 2、Combined drill bit and countersink bit is great for drilling, chamfering, deburring and countersinking 3、There are 10 sizes of 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 7mm, 8mm, 10mm and you can choose the one you need 4、Five flutes design provides small chip loads and quicker removal, it can discharge wood sawdust more rapidly and smoothly 5、Suitable for drilling holes on board of low hardness such as wood, plastic and other soft material <div class="wang-edit-text"> <strong><span style="color:#E53333;font-family:Arial;font-size:18px;">Features:</strong> <ul> <li> <span style="font-family:Arial;font-size:18px;">Drill bit is made from carbon steel and countersink is made from good quality 45# steel which ensures a long service life. </li> <li> <span style="font-family:Arial;font-size:18px;">Combined drill bit and countersink bit is great for drilling, chamfering, deburring and countersinking. </li> <li> <span style="font-family:Arial;font-size:18px;">There are 10 sizes of <span style="font-family:Arial;font-size:18px;">3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 7mm, 8mm, 10mm<span style="font-family:Arial;font-size:18px;"> and you can choose the one you need<span style="font-family:Arial;font-size:18px;">. </li> <li> <span style="font-family:Arial;font-size:18px;">Five flutes design provides small chip loads and quicker removal, it can discharge wood sawdust more rapidly and smoothly. </li> <li> <span style="font-family:Arial;font-size:18px;"> Suitable for drilling holes on board of low hardness such as wood, plastic and other soft material. </li> </ul> <strong><span style="color:#E53333;font-family:Arial;font-size:18px;">Specifications:</strong> <span style="font-family:Arial;font-size:18px;">Material: Carbon steel(drill bit), 45# steel(countersink) <span style="font-family:Arial;font-size:18px;">Countersink Flute: 5 <span style="font-family:Arial;font-size:18px;">Drill Bit Diameter: 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 7mm, 8mm, 10mm, 3-10mm(<span style="font-family:Arial;font-size:18px;">3/4/5/6/7/8/10mm<span style="font-family:Arial;font-size:18px;">), 3-6mm(<span style="font-family:Arial;font-size:18px;">3/4/5/6mm<span style="font-family:Arial;font-size:18px;">)(Optional) <span style="font-family:Arial;font-size:18px;">Countersink Diameter: 15.8mm <span style="font-family:Arial;font-size:18px;">Hex Key Size: 55 x 20mm <span style="font-family:Arial;font-size:18px;">Quantity: Your choice <strong><span style="color:#E53333;font-family:Arial;font-size:18px;">Package Includes:</strong> <span style="font-family:Arial;font-size:18px;">1pc(or 1 set) x Countersink Drill Bit <span style="font-family:Arial;font-size:18px;">1 x <span style="font-family:Arial;font-size:18px;">Hex Key <span style="font-family:Arial;font-size:18px;"> <span style="font-family:Arial;font-size:18px;"><span style="color:#E53333;"><strong>Note: </strong>There are only 7pcs in 3-10set, and only 4pcs in 3-6set. <style> .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }</style>