Premium 18-8 Stainless Steel Phillips Pan Head Machine Screw Kit - 1251pcs - Assorted stainless steel Phillips Pan Head Machine Screws in inch sizes #4-40 through #10-32 in a durable metal box. Lengths up to 1-1/2". This fastener kit includes matching stainless steel hex nuts for the machine screws. All fasteners in this kit are 18-8 stainless steel. See table below for more specifications.