Mainly used for molds, chassis, cabinets, industrial equipment, electrical appliances. These manually retractable plungers have a rest position in which they can stay in the retracted position. Practical accessories for machinery industry... Surface treatment: galvanized; Material: carbon steel. Buy Pull Pin Spring Plungers | BSD-70LO | Reid Supply Positioning Pin Buy Weld Mount Retractable Spring Plunger | PI3/8-1.5LOBTR6 | Essentra Components Steel Plunger With the characteristics of corrosion resistance, durability and practicality. The carbon steel construction is galvanized for rust resistance, and the L-handle makes it easy to lock/unlock. Stays retracted when you want, pops out when needed The basic parts or accessories of the machine. Practical accessories for machinery industry, convenient and easy to use.