This product has a thread size of 1/4inch-20inch and a thread length of 0.500inch, which is and easy to carry. It takes up little space and can put in the toolbox. This product is suitable for rolling toolboxes, cockpits, molds, chassis, industrial equipment, electrical appliances, automobiles, etc. It can also replace key ring pins. This retractable spring plunger is made of premium stainless steel and aluminum alloy, which is sturdy and stable to use. It is not easy to break and can be used for a long time. These retractable spring plungers are quick to install within few minutes without threading or tapping. It can save time and effort, improving working efficiency. you get 2 pieces of spring pins in M6 type, enough quantity for using in different places at one time, also you can replace the broken one in time, Manufacturer: Akfldms