Material: Stainless steel SUS303. Steel thread inserts can effectively improve screw connection, greatly improving the reliability. #1 M3 0.5 M5 0.6 6 4.6-4.7 4.7-4.8 8 10pcs 5g / 0.2oz. #2 M4 0.7 M6.5 0.8 8 6.0-6.1 6.1-6.2 10 10pcs 11g / 0.4oz.
eBay