Their arbor is 5/8"-11 Female Thread.

This package carries (a)-(c):

(a) 1 Piece of 10mm / 3/8" Diameter Diamond Vacuum Brazed Coarse Finger Bit / Milling Bit / Zero tolerance grinding drum for stone granite marble porcelain ceramic sink hole slight cutting, inner edge polishing, shaping, enlarging (5/8"-11 Female Thread arbor).

(b) 1 Piece of 4-1/2" Diameter Diamond Super Thin Mesh Rim Turbo Saw Blade for stone granite marble ceramic porcelain glass cutting. (Non Threaded. Inner Hole diameter 7/8"-5/8").

(c) 1 Piece of 4" aluminum velcro Pad Holder / Backer (5/8"-11 Female Thread arbor). 

ONE SET of 4" Diamond dry Polishing pad 5 Step for granite marble ceramic porcelain concrete:

ONE X STEP 1, STEP 2, STEP 3, STEP 4, STEP 5.