The router bit and pad holder's arbor is 5/8"-11 Female Thread.NOT M14 Thread.

Important Remind: Pad Holder's max capacity / velocity is 5000 RPM.
Please do not use it with high speed grinder or polisher.
This package carries (a)-(c):(a) 1 Piece of V50 (50mm / 2") Full Shape Bullnose Diamond Brazed Router Bit/Profile for 50MM (2") HIGH OR THICK STONE CONCRETE Travertine to do Full shape bullnose (5/8"-11 Female Thread arbor).

(b) 1 Piece of 4" / 100mm Diameter Diamond Turbo Saw Blade for granite marble ceramic concrete cutting. NON-THREADED. Inner Hole diameter is 7/8"-5/8".

(c) 5 Pieces of 4" / 4 Inch / 100 mm Diamond PREMIUM GRADE 5 STEPS DRY Polishing Pad for granite marble concrete:1 X Step 1 Step 2 Step 3 Step 4 Step 5.

And 1 Piece of 4" / 4 Inch / 100 mm Velcro Backer/Pad Holder (5/8"-11 Female Thread arbor).
Important Remind: Pad Holder's max capacity / velocity is 5000 RPM.
Please do not use it with high speed grinder or polisher.
-ideal speed of grinder/polisher: 3500-4500 RPM.
- please don't use with high speed grinder/polisher.