Check the listing for details. 30/40 Grit medium bond diamond tools-grind medium concrete prep HTC Quick-Change. Condition: New. Listed at 33.00 USD. Normal 0 false false false EN-US JA X-NONE Metal Bond Trapezoid 30/40 grit, Medium Bond Thick disc base is for strong holding of diamond segments under machine pressure while rotating to prevent tear-off when hit hidden obstacles. 30/40 grit grit is good for coarse grinding and removing thin coating and residues of glue. Two bars are for aggressively resurfacing. Medium bond matrix is effective for medium hardness of concrete floors. We also have 16/20#, 60/80# & 120/150# medium bond, hard bond and soft bond, as well as super hard bond and super soft bond in stock. Moreover, we carry those for most brands of grinders Shipping Policy Item can only be shipped to PayPal confirmed address. Return Policy We accept return only when the item is new/unused and in original box. Customer is required to pay your own shipping fee if not the reason of defect