1-1. Screw stock is usually an alloy of.

(a) copper, zinc, and nickel
(b) copper, zinc, and tin. 
(c) copper, zinc and lead 
(d) copper and zinc.

Send mail to THZABEL@HOTMAIL.COM with questions or comments about this web site.
Copyright © 2001 METALWORKING BOOKS
Last modified: December 08, 2001