Product Feature: 1. DIN standard: 7504K: Hex washer head self-drilling screw, Hex flange head self-drilling screw 7504P:Phillips Countersunk head self-drilling screw 7504N:Phillips Pan head self-drilling screw 2. Material: carbon steel(C1022), stainless steel(SS304,SS302,SS316,SS316L) 3. Surface treatment: zinc plated, Cr3+Cr6+Zinc plated, black, head colored, dacromet, HDG etc. 4. Thread: AB Type , A type 5. Size: 3.5x16mm – 6.3x150mm Advantage: 1. High hardness 2. High and low temperature resistant 3. Multicolor choose 4. Competitive Price 5. Superior Quality, TUV CERT ISO9001:2000 quality assurance 6. Artificial stone without any radiation 7. Punctual Delivery  8. Supply wooden pallet 9. Meet different market’s need: America, Europe, Asia, and so on.