63131449010, Fein KBH Carbide Tip 

49mm X 5/32" hole saw for pipes

Carbide teeth with optimum service life for use on pipe materials

 and curved surfaces with wall thickness up to 5/32 in (4 mm).

Metric dimensions, drilling depth 5/32 in (4 mm).
 

Fits:
KBH 25-2 U (KBH 25-2 U)