Various screw sets offer organized assortments of the most needed socket-head Cap Screws and Thumb Screws. SK Series Sets contain an assortment of stainless steel or corrosion-resistant black oxide coated screws, studs, washers and nuts, stored in a plastic case.The SK-10 Sets hold a variety of smaller and medium diameter screws for our smaller components in sizes 10-24, 8-32, and 4-40 (M5, M4, M3 and M2.5). SK-SS Sets contain a variety of cup-point set screws.And the SK-NYT-832 Set is a handy set if you should ever need to replace the 8-32 nylon tipped set screw. These are the same set screws that are used in most of Newport's optical mounts. The broach is an English/Metric compatible 5/64 (M2) hex.