Features
TIP: Can be used with a standard electric drill (not included), Always use lubrication (water), otherwise the diamond core drill will burn. Warnings: Not for use on Concrete or for depths beyond about 2"; Water is required for lubrication when drilling.
10 SIZES: Total 10 different sizes (6mm,8mm,10mm,12mm, 14mm, 16mm, 18mm, 20mm, 22mm, 30mm).Different sizes meet your different needs,help you in different places.
Specification
Package Size:5PCS--5-12mm, 10pcs--3mm-20mm