Ningbo Self Drilling Screw Material:302,304,316 SUS Size:3.5-6.3mm dia length:10---12 Product: Ningbo Self ... Material:410 304 316Size:3.5 3.9 4.2 4.8 5.5 6.3Head:countersunk,Pan head,hex head,washer headDrive style ... ,50,55,60,65,70 ,80,90,100,120 6.3 ×19,20,25,30,32,35,38,40,45,50 ...