Zzzy criticality code justification, inspec. system req. as per mil-i-45208 special features, material will be in accordance with ships parts control center activity hx quality control,manufacturing and testing specifications reference number differentiating characteristics

An item having a major diameter of 3 or more inches (76.2mm) other than items having spoked or sumulated spoked construction, which may be under 3 inches (76.2mm) designed to be gripped by the hand to transmit rotary motion to other devices through a center axis, fabricated in the form of a solid body with simulated spokes or a recessed surface between the rim and the hub, or it may be built up in the form of a frame having a central hub connected to the rim by the spokes. It may have reference markings in the form of dots, arrows, hairline, and the like., to indicate the relative position and\or direction of rotation of the items(s) with which it is used. It may also include an integral rathchet device. For similar items having a maximum diameter of less than 3 inches (76.2mm), see knob. For items calibrated in units or series divisions denoting relative positioning of associated devices, see dial (as modified) excludes:steering wheel