PDFWAC 296-807-18030
Use specific safety guards for vertical and angle grinders using Type 27, 28 and 29 wheels.
You must make sure safety guards:
(1) Cover the wheel's plane of rotation toward the operator for at least one hundred eighty degrees.
(2) Cover the side of the wheel toward the driving flange for at least one hundred eighty degrees.
(3) Have a lip on the outer edge that:
(a) Extends beyond the surface of the wheel throughout the one hundred eighty degree coverage; and
(b) Curls inward to deflect wheel fragments.