A guard using for the dish grinding wheel with a diameter below 230 millimeters, its thickness shall base on the thickness of that wheel no less than the value in Attachment table 30 regardless of the restriction of the first paragraph in the preceding Article 98 if its peripheral plate and fixed-side plate is made of a piece of seamless rolled steel.The top end of the guard shall be bent as shown in Attachment figure 8.Attachment table 30.pdfAttachment table 30.docAttachment figure 8.pdfAttachment figure 8.doc