This 510 Connector with floating pin effectively wedges between the battery and atomizer in a mech mod. adjusting the battery compartment length means you can adjust the screw down depth of the atomizer. It able to accept all toppers without having to do any type of manual adjustment on either the topper's or the APV's center post.Features-Color:As Shown-Material:Plastic and metal -Size:3.50X2.00X1.50cm/1.38X0.79X0.59in-It adds a Stronger Spring and a hole on the side of the center pin. This makes it easier when soldering your positive wire to the center pin.-The spring made of durable material and carries no current meaning you don't have to worry about the spring clasping when running high current through it.-This is a spring loaded 510 connector with spring loaded firing pin, simple design yet practical for use.-Used connect any atomizer and 510 battery,new style with wire connector, easierfor DIY mod.-It able to accept all toppers without having to do any type of manual adjustment on either the topper's or the APV's center post.Packing list2 x 510 battery connectors