Well built with solid cold ST12 steel which enhance the hardness and stability of the staple gun.The front crash pad can absorb the extra impact at working. Comes with 600 PCS staples(D-type*200, U-type*200, T-type*200),can be used to staple floor,furniture and other projects. Quick resolve the jam or stuck problem,only to release bottom metal drive channel of the stapler, and take jammed staples out. Easy adjust impact force by screwing the top release button,the more tighten and the bigger force.For safety, you need press the top button with one hand.