VEVOR Dry Core Drill Bit, 4.25"/108 mm Diameter 5/8"-11 Shank Arbor with a Pilot Bit & 4.5" Blade, 9.5"/241.3mm Depth Diamond Coring Bore Tool, Masonry Hole Saw Bits for Hard Concrete Brick and Block

This disc is included with your machine and can be used with a cutter or angle grinder to cut tiles, ceramics, or marble.

It is an sds arbor pilot bit.