The WSB QUICK MARKING SYSTEM ( 209-716) in white is a convenient and efficient solution for labeling terminal blocks and connectors. Part of the 209 series, this marker accessory features a Snap-On mating type for easy installation. Designed for vertical marking with black numbers, it ensures clear identification in any application. With a marker width of 4mm, it offers ample space for labeling. Not only is it halogen-free for environmental safety, but it also boasts a UL 94V-2 flammability rating for added peace of mind. Perfect for use in barrier strip jumpers, covers, and other terminal block accessories, the WSB QUICK MARKING SYSTEM is a reliable choice for organization and compliance.