Hardened and ground steel needle points, one straight and one bent, are fixed to a knurled body.
National Hardware Hinge Butt Marker, Removable, Series: V511 3.5, 3-1/2 in Length, Steel, Black, Wall Mount, For Marking Mortise on Residential Hinges
Designed to mark mortise on residential hinges. Black, corrosion protective finish. Made with heavy-gauge cold-rolled steel.