Features 1、Made of carbon steel material, these ball plungers are sturdy and durable. 2、Widely applicable for mechanical devices, clamps, molds, automatic machines, etc. 3、They are great parts for providing pressure and accurate positioning. 4、Easy to install and convenient to use. 5、There are total 10 pieces of ball plungers in one set that you may use for many projects. Specification Features: Made of carbon steel material, these ball plungers are sturdy and durable. Widely applicable for mechanical devices, clamps, molds, automatic machines, etc. They are great parts for providing pressure and accurate positioning. Easy to install and convenient to use. There are total 10 pieces of ball plungers in one set that you may use for many projects. Specification: Material: Carbon steel Type: M12*16, M12*20, M12*25, M12*30 (Optional) Quantity: 10pcs Weight: 82g~156g / 2.9oz~5.5oz (approx.) Package list: 10 * Ball Plungers Package List