[Type]: Self-tapping screw. Head style: Cross Countersunk Head Screw Type [Sturdy Material]: These hex nuts are made of nickel-plated carbon steel, it provides strength and good corrosion resistance in many environments. [Wide Application]: These screws are suitable for door handles, machinery industry and other small repairs around the workshop, garage or home furniture fixings, etc. [Package]: 340pcs and a box.60PCS M3.0x10,60PCS M3.5x12,50PCS M3.5x16,30PCS M3.5x25,30PCS M4.0x10,40PCS M4.0x12 ,30PCS M4.0x10,40PCS M4.8x12 [After-sales service]:Our product has 2 years quality guarantee, if your product has any problem please send an email to the seller at the first concern. We will solve the problem within 24 hours.