Link to the markers on the HF web page:
From the web page:
Clog-Resistant Jobsite Permanent Markers, 2-Pack
Product Overview
These Clog-Resistant Jobsite Permanent Markers are designed for the tough demands of construction sites. The durable, fine tip writes on dusty, wet and oily surfaces without clogging and is optimized for rough surfaces such as OSB, cinderblock, and concrete. The cap can be left off for up to six days without drying out.
Fine point for precise marking
Industrial design with pocket clip plus lanyard loop/hard-hat clip
Anti-roll body
Writes on paper, wood, steel, aluminum, plastic, brick, and concrete