Clubhead
a. Plain in Shape
The clubhead must be generally plain in shape. All parts must be rigid, structural in nature and functional. It is not practicable to define plain in shape precisely and comprehensively but features which are deemed to be in breach of this requirement and are therefore not permitted include:
(i) holes through the head,
(ii) transparent material added for other than decorative or structural purposes,
(iii) appendages to the main body of the head such as knobs, plates, rods or fins, for the purpose of meeting dimensional specifications, for aiming or for any other purpose. Exceptions may be made for putters. Any furrows in or runners on the sole must not extend into the face.
b. Dimensions and Size
(i) Woods
When the club is in a 60 degree lie angle, the dimensions of the clubhead must be such that:
(a) the distance from the heel to the toe of the clubhead is greater than the distance from the face to the back;
(b) the distance from the heel to the toe of the clubhead is not greater than 5 inches (127 mm); and
(c) the distance from the sole to the crown of the clubhead is not greater than 2.8 inches (71.12 mm).
These dimensions are measured on horizontal lines between vertical projections of the outermost points of:
. the heel and the toe; and
. the face and the back (see Fig. VIII, dimension A); and on vertical lines between the horizontal projections of the outermost points of the sole and the crown (see Fig. VIII, dimension B). If the outermost point of the heel is not clearly defined, it is deemed to be 0.875 inches (22.23 mm) above the horizontal plane on which the club is lying (see Fig. VIII, dimension C).
The size of the clubhead must not exceed 28.06 cubic inches (460 cubic centimetres), plus a tolerance of 0.61 cubic inches (10 cubic centimetres).
Note: Clubs in breach of the maximum size limit as specified in Appendix II, 4b (i), which were in use or marketed prior to 1st January 2004 and which otherwise conform to the Rules, may be used until 31st December 2004.
(ii) Irons and Putters
When the clubhead is in its normal address position the dimensions of the head must be such that the distance from the heel to the toe is greater than the distance from the face to the back. For traditionally shaped heads, these dimensions will be measured on horizontal lines between vertical projections of the outermost points of:
. the heel and the toe; and
. the face and the back.
For unusually shaped heads, the toe to heel dimension may be made at the face.
c. Striking Faces
The clubhead must have only one striking face, except that a putter may have two such faces if their characteristics are the same, and they are opposite each other.
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