Diamond Grinding Discs Grinder Pads Compatible with HTC Greyline Professional Grinders Standard Bond: for medium-soft to medium concrete Two grinding segments size: 40 x 11 x 11 mm. Grit Size: #60/80. For wet or dry use Packaging: Set of 9 Pieces Compatible Equipment: Compatible with HTC floor grinders; Compatible with Greyline 270/ 400/ 450/ 550; Compatible with Professional 270EG/800RXP/950RX/1500IXT (9-Pack) Diamond Grinding Discs Grinder Pads Compatible with HTC Grinders, Compatible with Greyline Grinders, Grinding Concrete Floor, Standard Bond, 60/80 Grit