34 Pa. Code § 45.21 – Axes, sledges, and wedges.

(a) Ax and sledge handles shall be of sound, dense hickory, ash, maple or material of equivalent strength. A stock of ax handles of assorted lengths shall be readily available for the use of fellers and choppers.
(b) Wedges of steel or hardwood shall be available for fellers and choppers.
(c) Wedges and hammer heads which show burrs extending more than 1/8 inch from the body of the tool shall not be used until they have been dressed either on an abrasive wheel or by forging.