This package carries (a):

(a) 2 Pieces of B13 (13mm / 1/2" Radius / Demi / Half Bullnose)  Diamond Brazed 

 Router Bit/Profile  FOR 13MM (1/2") HIGH OR THICK STONE CONCRETE  (5/8"-11 female Thread arbor).

-ideal speed of grinder/polisher: 3500-4500 RPM.

- please don't use with high speed grinder/polisher.

-with water feed hole, can be wet use.