NOTICEOne set includes: SGR20/SGR20N Rail*1 (BLACK)+SGR15 Block*1 (BLACK)Please be told that shipping outsized items could come across customs clearance disorders or require the fee of tariffs, which might be the responsibility of the customer.Custom machining consistent with drawings accepted! Precision customization available! Bulk orders welcome! Please seek the advice of the vendor or e-mail us at weareyoung0722@gmail.com for details.If you've any other question, please be at liberty to touch me at any time :).Q: Do you help machining merchandise based on visitor drawings?A: Yes, we are able to machine products in keeping with customer drawings. Customers can publish their drawings to our AliExpress customer service or e-mail them to weareyoung0722@gmail.com. The machining charge depends on the categorical drawings, and the customization era is typically inside 10 days.Q: What is the precision of the product?A: The default precision of the product is C7. If you require a selected precision other than C7, please touch customer support or e-mail us at weareyoung0722@gmail.com.If you've got every other question, please feel free to contact me at any time :).