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. 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, , chassis, industrial equipment, electrical appliances, automobiles, etc. It can also replace key ring pins. you will get 4 pieces of spring pins in M6 type, enough quantity for using in different at one time, also you can replace the broken one in time Product Name:Hand Retractable Spring Plunger Use without:tool hand screw Surface dealing:electroplating Intensity level:10.9 Head shape:cylindrical head Quantity:8PCS Colour:Red Material:Stainless steel + aluminum alloy Size:12.7x25.1mm Package Contents: 4 * spring pins in M6 type 4 * screws Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.