Features: *Ideal for families, personal hobbies, industry, etc *Use electric drills (not including electric drills) to work better *Can cut holes in marble, slate, glass, tiles, stone, etc *Ability to drill into hard materials such as stone and glass *Use low speed settings and proper cooling, such as water, to ensure a longer life Specifications: *Name:dimond drill bit *Type:Triangular handle *Color:black *Material: Aluminum Alloy *Length:65mm *Hole Saw Diameter: 20mm,25mm,30mm,35mm,40mm,42mm,45mm,50mm,55mm,60mm (Approx.) *Quantities:1pc Package Contents: 1*Drill Bits Note: 1. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. 2. Please allow slight manual measurement deviation for the data.