These small knobs are ideal for a variety of pull applications such as doors, access panels, and engine choke cables. The octagon top on the PL3 adds a unique and modern look while making the knob easier to automate on the assembly line. The PL3 also features a textured center that can be engraved with a logo or instructions. The PL4 has a more traditional style with knurls for easy gripping. The standard insert is a nylon insert locknut to prevent loosening. Insert materials include steel, brass, stainless, and aluminum.