These corby bolts are made of copper, stainless steel or brass. You must choose size and type in the variations drop down. price is for one corby bolt. The dimensions are below
Over all length-1″
post length- .33″
thread length- .165″
– There are two different sizes-
Head diameter  1/4″ with 3/16″ diameter post
Head diameter 3/16″ with 1/8″ diameter post
Thanks for looking and God bless