Rich quantity: 6 pieces HSS drill bits chamfered 90 degrees 3 flute end mills, large quantity can meet your daily usage and replacement Numerous occasions: HSS countersink drill bit is suitable for workpieces with a hardness of up to 25 degrees, such as aluminium, thin iron, insulation or PVC sheets, practical in Leave no scratches: quality countersink drill bit set provides good deburring and leaves no scratches, nicely improving your work efficiency Good compatibility: chamfer countersink bits sets are compatible with a wide range of common drilling rigs, including vertical rigs, so you can apply with confidence 3 Flute design: with 3 flutes and staggered cutting teeth, these 90 degree high speed steel deburring tools chip flow smoothly, fast cutting, no chatter, more concentric and easier to use Colour: silver Material: high-speed steel Package Contents: 6 x chamfering tool (6.3/8.3/10.4/12.4/16.5/20.5mm) Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.