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This package carries (a)-(b):

(a) Angle Grinder 5/8"-11 Lock Nut & Backing Flange &

 Wrench Set.

Please make sure that your grinder's / polisher's spindle is 5/8"-11

 thread.

with this lock ring nut and wrench set, your 5/8"-11 spindle grinder /

 polisher can work with all 5/8" non-threaded abrasive tools.

(b) 6 Pieces of 4 1/2" / 115mm Diamond Turbo grinding cup wheel 

for stone concrete travertine masonry surface grinding / smoothing.

It is non threaded, inner hole diameter is 7/8" to 5/8" (washer

 included).