... :4.8 ,6.8,8.8,9.8.. BIG HEAD,SPECIAL HEAD SCREW,WHITE PHILLIPS HEAD SCREW . A good non-standard fastenerS manufacturer for ... steel,Alloy steel,Copper,Aluminum are available.Carton steel is high quality iron,such as 1022,1018,1010,1008,1015...Medium ... other company,but is reasonable for products,it will spend high control force from material till products reach in customer hands ...