Important Remind: Pad holder’s max capacity / velocity is 5000 RPM.Please do not use it with high speed grinder or polisher.V40 router bit is for 40mm (1-1/2″) Thick or High stone concrete travertine to do Full shape bullnose. This package carries (a)-(f):(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) 1 Piece of 4″ / 100mm 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). (c) 1 Piece of 4″ / 100mm Diamond Cutting Saw blade for stone concrete travertine. (d) 1 Piece of V40 Diameter Diamond Full Shape Bullnose Router Bit (for 40MM or 1-1/2″ Thick or High stone concrete travertine to do Full shape bullnose). Its arbor is 5/8″-11 Thread.(e) 1 Piece of 4″ / 100mm Pad Holder (its arbor is 5/8″-11 Thread).and 8 Pieces of 4″ / 100MM diamond polishing pad for stone concrete travertine:1 X Grit 50 100 200 400 800 1500 3000 10000.(f) 1 Piece of 2″ / 50mm Diameter Diamond Core Drill Bit and Zero tolerance grinding drum (Two In One).It do the stone concrete travertine ceramic sink hole cut and inner hole edge polish at the same time. Save time Save money.Important Remind: Pad holder’s max capacity / velocity is 5000 RPM.Please do not use it with high speed grinder or polisher.