Features: 1.It made of high speed steel,high hardness,good wear resistance and durability. 2.High hardness,good wear resistance and durability. 3.Has a heavy-duty spiral flute design that produces fast chip ejection. 4.High working efficiency, perfect punching effect and long using life. 5.Suitable for drilling holes in wood, walnut, Bodhi seed, etc. Descriptions: 1.This is a twist drill bits set,made of high speed steel,high hardness,good wear resistance and durability. 3.Suitable for drilling holes in in wood, walnut, Bodhi seed, etc. Specifications: Material:HSS Bits sizes(optional) : 10pcs(0.8-3.0mm):0.8/1.0/1.2/1.5/1.8/2.0/2.2/2.5/2.8/3.0(mm) 25pcs(0.5-3.0mm):0.5x5/ 0.6x5/ 10x3/ 1.2x2/ 1.5x2/ 1.8x2/ 2.0x2/ 2.35x2/ 3.0x2(mm) 50pcs(1.0-3.0mm):1.0x10/ 1.5x10/ 2.0x10/ 2.5x10/ 3.0x10(mm) Length:29-59mm, 22-60mm, 33-60mm Package informations: Package Size:150x100x20mm/5.85x3.9x0.78in Package weight:25g/0.88oz Plastic Box Package Package included: 1 x Twist Drill Bits set Noted: 1.Please allow 1-2mm errors due to manual measurement. 2.Item color displayed in photos may be showing slightly different on your computer monitor since monitors are not calibrated same.