OOTDTY Features: Simple structure, easy operation. High speed steel, very long life time, good flexibility and abrasion resistant. Tight and stable fixing, high precision. Suitable for drills, boring bars, engravers, reamer, etc. Cutter holder only, other accessories shown in the picture are not included! Specification:Material: High Speed SteelSize: 6mm, 6.35mm, 8mmColor: As Pictures ShownQuantity: 3pcs/setNote:Please allow 0-1cm error due to manual measurement. Pls make sure you don't mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!Package Contents:Cutter Holder 1x6mm1x6.35mm Cutter HolderCutter Holder 1x8mm