Product Name : Hole Saw;Material : Metal Cutting Diameter : 20mm / 0.78inch;Shaft Size : 6.5 x 20mm / 0.25inch x 0.78inch (D * L) Shaft Hole Dia : 4mm/ 0.16inch;Side Hole Size : 12 x 5mm/ 0.4inch x 0.2inch(L*W) Total Length : 47mm / 1.8inch;Color : Sier Tone Weight : 15g; Product Description Designed with diamond coated tip and sturdy metal body, gives good performance and longer life. Excellent for making clean and accurate holes on glass and tile. Works better with an electric drill (here is not included). package Contains:1 x Hole Saw with box 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. Note: Các sản phẩm có chất liệu vàng, kim cương, đá quý trong shop đều là xi mạ/ nhân tạo.