Features: Metal material, high hardness and durability. Multiple specifications to meet a variety of needs. Color: Black Material: Metal Package Contents: 6 x Sleeve(14mm, 17mm, 18mm, 19mm, 21mm,22mm) 2 x Adapter 2 x Bolt 2 x Apron 1 x Drill chuck 1 x Batch head Only the above package content, other products are not included. Note: Light reflection 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.