Total Size: Approx. 56 x 51mm - Internal Thread Diameter: 17mm. The practical function of this rotary accessory is to effectively block dust, mud, wood chips and other debris during operation. The rotary shield can be quickly adjusted in position, provides easy access to the accessory, does not interfere with the workpiece, as it redirects debris and sparks. Attaches to a rotary tool in place of its nosepiece for quick and easy installation, simply install the protective cover directly into the nosepiece. 39; power tool and tighten it. Suitable for Dremel 100, 200, 275, 285, 300, 395, 398, 400, 770, 800, 3000, 4000, 8100, 8200, 8220, 4200, perfect for deflecting sparks and debris when cutting, sanding, polishing, etc. Quantity: 4 pieces Color: transparent white color