Danray's bench grinder safety scale has been designed to check the openings between the grinding wheels and the tongues and work rests for compliance with OSHA and ANSI grinder safety standards. This scale has a 0.25"-diameter hole in it for attachment to bench grinders for easy verification of the proper adjustments by employers and operators. The orange-colored scale is made out of durable, 0.090"-thick anodized aluminum and has easy-to-read text and graphics that will not rub or scratch off. It is about the size of a credit card, which makes it convenient to carry and store.