Great for joining plastic and thick fabric. Used for DIY home uses, business, automotive, aviation, duct-work, elevator, instruments, furniture etc Made of high quality aluminum alloy, never rust, good anti-corrosion property, sturdy, light, durable and long life The flange is larger than common type, with larger contact area, can increase torque strength and withstand higher radial tension The blind rivets has a mandrel which permits the formation of an upset on the blind end of the rivet and expansion of the rivet shank during the setting to join the component parts of an assembly. Package Content - (250pcs) 1/8in. x 1/4in. || (250pc) 1/8in. x 5/16in. || (250) 1/8in. x 3/8in. || (250) 1/8in. x 5/8in. and Storage Case