Workholding equipment is predominantly used for metalworking and industrial use. They're not exactly for lightweight purposes or hobby-oriented goals.
Clamps
There are so many kinds of clamps to choose from, that it could get kind of overwhelming. You may want something simple, like an angle clamp, which can hold material depending on the angle (most likely 90 degrees). Bar and pipe clamps are made for exactly what they sound like they're made foroperated machinery.
Vices
The two main types of workholding vices are bench vices and pin vices. Bench vices come in many varieties. They can either sit comfortably on top of a work center or attach to it on the side. Either way, they're used for holding materials during soldering, welding, cutting tubing or painting. Some are even 'electronic work centers' which means they're great for use when working with computer parts and electronic materials. They're strong and sturdy and can withstand wear and tear. Pin vices, on the other hand, are much smaller. They're basically used for drilling holes into materials. They hold small pins and drill bits. The name is semiall it is still used to hold things in place so it's not really that different.
Spring Plungers
There are three major types of spring plungers. These are ball nose, hex nose and push fit ball nose plungers. They are often made of materials like stainless steel and are either threaded or non-threaded, sometimes even slotted. Ball nose spring plungers have a rounded end. Hex nose plungers look like they have a little handle at the end. This really is just to help with adjustment and mobility during insertion. The push fit plungers are smooth, not contoured. They should slide in without too much hassle. Make sure you get the right measurements before you purchase. You'll also want to check the end pressure and decide if you want light, standard or heavy.