If our products have any problems,we can provide replacement /Return Service,welcome to contact us anytime!It consists of a head(tip section),drill body (screw part)and shank (holding portion)composition.It is a practical,in a variety of wood drill bit Compatible with drilling through-hole model relates.Size:18mm,20mm,22mm,25mmUse:Wood Cut Suit Compatible with woodworkingSize:Auger Twist Drill Bit:10mm,12mm,14mm,16mm,18mm,20mm,22mm,25mmConnecting Rod:300mmUse:Wood Cut Suit,WoodworkingColor:Black+SilverMaterial:High Carbon Steel&alloyPackage Contents:1 set *Luo drill (4pcs)8 x Luo drill1 x 300mm connecting rod1 x small wrenchOnly the above package content,other products are not included.Note:Light shooting 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.