Special Features:

Female drive facility tapered 1.500 in. Per foot, small end diameter 0.660 in. Min, 0.663 in. Max and periphery of wheel has 25 grooves equally spaced and numbered 0 through 24 legend letters 0, 5, 10, 15, 20 groove dim. 0.063 in. Deep by 0.094 in. Radius all other grooves are 0.031 in. Deep by 0.063 in. Radius, grooves and notches painted black

Properties:

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, etc., to indicate the relative position and/or direction of rotation of the item(s) with which it is used. It may also include an integral ratchet device. For similar items having a maximum diameter of less than 3 inches (76.2mm), see knob. For items calibrated in units or series of divisions denoting relative positioning of associated devices, see dial (as modified). Excludes steering wheel.