VEVOR Linear Guide Rail Set, SFC20 1200 mm, 2 PCS 47.2 in/1200 mm SFC20 Guide Rails 4 PCS SC20 Slide Blocks 4 PCS Rail Supports, Linear Rails and Bearings Kit for Automated Machines CNC DIY Project

The size is m6.

It is 40mm.

I did not find any information about requiring lubrication or recommended lubrication types in the product description or customer reviews.

The product description does not mention anything about the mounting orientation. However, it states that the linear rail kit is widely used in high-load automation equipment and DIY projects, which implies that it can be mounted horizontally or vertically based on the application requirements.

Based on the product information, it can be mounted horizontally. The linear guide rail set features an aluminum base with accurate mounting holes, allowing for reliable installation and connection in various orientations.

The product information does not explicitly mention if mounting hardware and instructions are included. However, it does state that the aluminum support rails have pre-drilled holes for easy installation.