and practical Four flute design provides small chip loads and quicker removal Application Material: wood, plastic, aluminum plate, etc Suitable for DIY, home and general building/engineering using and high quality Material: HSS Color: Silver Shank: straight shank Flutes: 4 Outside Diameter: 1.5mm,2mm,2.5mm,3mm,3.5mm,4mm,4.5mm,5mm,5.5mm,6mm SIZE(mm): Diameter of Head(A)-Diameter of Shank(B)-Blade Length(C) -Total Length(D) 1.5 - 6 - 4 - 50 2 - 6 - 7 - 51 2.5 - 6 - 8 - 52 3 - 6 - 8 - 52 3.5 - 6 - 10 - 54 4 - 6 - 11 - 55 4.5 - 6 - 15 - 60 5 - 6 - 13 - 57 5.5 - 6 - 13 - 57 6 - 6 - 13 - 57 Quantity: 20pcs Package includes: 20PCS x Drill Bits 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.