Specification Brand : SIGNI BulletPoint : Bearings BulletPoint1 : This disc has a plastic back and does not require a backup pad. BulletPoint2 : It lasts up to 7-10 times longer than conventional aluminum oxide resin fiber discs. BulletPoint3 : Its design minimizes the loading of material being ground on the disc. BulletPoint4 : It cuts faster than a conventional grinding disc. BulletPoint5 : It can be both dry grinding and wet grinding. BulletPoint6 : Tip - Wear appropriate protective equipment: Always wear dust masks, goggles and earmuffs when using to protect yourself from concrete dust and noise. Pay attention to applying appropriate pressure and do not exceed 1000RPM when using concrete grinder wheel 4.5 Color : Black CompatibleDevices : Angle Grinder ConstructionType : Grinding ExternallyAssignedProductIdentifier : 9064624639023 ExternallyAssignedProductIdentifier1 : 682601960688 ExternallyAssignedProductIdentifier2 : 0682601960688 ExternallyAssignedProductIdentifier3 : 50638060900098 GpsrSafetyAttestation : 1 IncludedComponents : SiC IndustryStandardIdentifier : Backing Pad ItemName : SIGNI 5 Pack SiC Plastic Back Grinding Wheel for Granite/Marble/Concrete and Glasses (4.5 INCH, 24 GRIT) ItemPackageDimensions_Height : 12.9 centimeters ItemPackageDimensions_Length : 6.4 centimeters ItemPackageDimensions_Width : 12.7 centimeters ItemPackageQuantity : 25 ItemTypeKeyword : abrasive-grinding-discs Manufacturer : Signi Industrial (Shanghai) Co.,Ltd Material : 24 GRIT MaximumRotationalSpeed : 13300 rpm ModelName : ZC ModelNumber : Fan NumberOfItems : 5 PackageLevel : unit PartNumber : Fan ProductDescription : S/C (Silicon Carbide) These grain types are very aggressive. The grinding disc is flat with a plastic back. The sanding disc fits most angle grinders and does not require a backing pad. The grinding disc attaches directly to the hand of the grinding machine. In comparison to depressed center wheels or resin fiber discs it is lighter, cuts faster, and grinds faster while leaving an even surface. Plastic Backing Disc have advantages , it is not easy to break and deform when damped,it uses special high quality engineering plastic as the backing,which increases the strength of product. The Disc can be dry grinding as well as water polishing,water resistance is good,not easy to deform. Plastic backing disc design allows for more control when grinding corners and edges. No deformation when used in heat or humidity . Can be Used both wet and dry. No back-up pad needed.