Wafer Head Self-Drilling Screw
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They have a sharp point to penetrate through thin steel ideal for installing in sheet materials indoors against wood or steel joists.
Material Carbon Steel/ Stainless Steel Surface Zinc/ Yellow Zinc/ Black Phosphate/ Rusptert Diameter #8/#10 ( 4.2mm/4.8mm ) Length 1/2"--2" ( 13mm - 50mm ) Package Bulk/ Carton Box/ Plastic Bucket 
