Material: 304 stainless steel,Does not rust in fresh water and airInternational common size,Please discuss with the size desk for detailed dimensions.Please notice that for example,Size M6x50mm potential that: the bolt diameter is M6 (approximately 6mm),Excluding the thickness of sleeve pipe,and 50 means that the length of the bolt part.Size M6,8mm drill is usually recommended for drilling.Size M8,10mm drill is recommended for drilling.Size M10,12mm drill is usually recommended for drilling.Size M12,14mm drill is recommended for drilling.▲Feature1. 100% Brand new and high quality. International typical size.2.304 stainless-steel materials, Waterproof and rust proof3.The surface has been polished and the surface is soft and bright.4.Corrosion resistance,It is durable and convenient.5.The size is lengthened. It is specially produced for you. It is difficult to buy in the market and has total sizes.6.Simple design and easy to use.Package Includes: 304 Stainless Steel Expansion bolt with ring 1pcs.If you buy 2pcs or more, the components will mechanically reduce the worth through 3%If you would like a lot, we are able to give you a reputable discount, please leave a message and call us.Please note:304 Stainless metal possibly has weak magnetic304 stainless-steel generates magnetism throughout the production process, and this product has no longer passed through demagnetization treatment.(You can use Google search for its characteristics), 201 chrome steel nearly no magnetic, But the quality of 201 stainless steel is worse than 304 stainless steel. Please don't judge stainless-steel by way of its magnetic properties.