1. Be specially designed for drilling of water tanks and other stepped holes. 2. Provide simple operation and convenient use.Drill holes neat, smooth, no broken edge. 3. Vacuum Brazed Processing, high diamond concentration provides for a faster cut rate while the high quality of the diamonds provides longer working life. Sizes:40-60mm Handle: Triangular handle Working depth:36mm Height: 64mm Diamond Height: 10mm Applicable Machine: Electric hand drill Colour:Gold Material:alloy Package Contents: 1 * M10 Vacuum Brazed Hole Drill 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.