1,000 pieces 

#10 X 5/16 Pan Sheet Metal Screw Type-B Blunt point Black Oxide rounded 3/16x5/16

5/16" long measured from under the head

3/8" wide head  x .106" thick head 

Made in Japan 

These parts look great so please buy with confidence.   

We are a stocking fastener distributor in business since 1948.