The product is a set of 6 Vlier S56 stainless steel spring plungers with a standard hex drive. Each plunger has a screw size of 5/16-18 x 1.0 inches, a threaded size of 5/16-18, and an item length of 1 inch. Made of stainless steel and steel, these plungers are durable and reliable for various industrial and business applications. With the Vlier brand known for quality hardware, these plungers are a valuable addition to any fastener collection.