VIKING arbor with SDS+ shank for hole saw diameters Ø14-30 mm comes with a short HSS pilot drill (MPD4S) used together with HSS Bi-metal holesaws.
If cutting leca/soft brick, please use a Carbide Cut holesaw together with a long Carbide tipped pilot drill (MPD4CT).
When cutting any other material than leca/brick, please use a long HSS pilot drill MPD4 when using Carbide Cut holesaws.