Product description：Color: Black and Transparent Fits Tool Model: 100 ，200， 275 ， 285 ，300， 395 ，398， 400， 770， 800 ，3000 ，4000， 8100 ，8200 ，8220， 4200 Model Number:A550 Electric grinding threaded port:17.5-19MMFeatures:Works to deflect debris on a variety of applications including cutting, sanding, grinding and polishing. The shield can be quickly adjusted into position, provides easy access to the accessory, and does not interfere with the workpiece. Spring friction design allows for quick adjustment and accessibility to accessory. Attaches onto a rotary tool in place of its nose piece for quick and easy installation.Package Included:2 x Electric Grinder Cover Case