features:
--100% and high quality.
--can be used with a standard electric drill.
--always use lubrication water， otherwise the diamond core drill will burn.
--materials and only needs water for lubrication.
--this diamond coated core drill bit removes a complete circleglass， marble， tiles，granite， ceramic or other.
specifications:
size: 8mm/0.31"， 10mm/0.39"， 14mm/0.55"， 16mm/0.62"， 18mm/0.7"， 22mm/0.86"，26mm/1.02"， 38mm/1.50"，45mm/1.77"，50mm/1.97"
material: steel
use note:
start your hole diagonally， make a round trace and then hold drill straight.
package includes:
1 set diamond hole saw 10pcs