AeroMarine Products Notched Spreaders are 4-sided spreaders with a choice between 1/16″ (2mm), 1/8″ (3mm), 1/4″ (6mm) and 1/4×1/8″ (6x3mm) notches. Use these when applying epoxy coatings to ensure that your coating is the correct depth! Durable plastic construction ensures that you can use it again and again, but also means that replacing them will be affordable when they accrue too much crud.