Feature:High security; Made with a solid brass construction; No small parts to lose like other cheap backs; super secure and durable.Low profile for a comfortable fit; it is only 7mm tall and 10mm in diameter; No more lost pins The harder you pull the pin, the tighter it clutches. Work as good as the one with set screws; easily unlock from the rear. No tools needed like other backs; No set screws to loosen up; easily snaps on and off buttons; just push on and it is secured, squeeze-pull on the little flange on the back to lease the spring locking.No Pin Poke-through to irritate your skin like other cheap metal backs; People love these smooth and low profile pin back clasps. Airline pilots are buying like mad, using these pin backs to secure their wings.No more bloody fingers, no more torn fingertips from removing the cheap backs from your pin book.Fit for Disney Pins, Harley Pins, Military Pins, Name tags, Badges, Medals, Insignia and all pin post pins.Description:Material: MetalColor: GoldSize: 1cm x 1cm x 0.6cm (0.39" x 0.39" x 0.24")Package incldue:100Pcs/set Backs Keepers