VEVOR Linear Guide Rail Set, SFC20 1000mm, 2 PCS 39.4 in/1000 mm SFC20 Guide Rails 4 PCS SC20 Slide Blocks 4 PCS Rail Supports, Linear Rails and Bearings Kit for Automated Machines CNC DIY Project

Hi. Please tell me the diameter of the screw holes in the slide blocks and the mounting blocks ?

Can you please specify the material of the rods? For example, it is material xy, see for example the marking below 1.4301 (AISI 304) 1.4305 (AISI 303) 1.4404 (AISI 316L) 1.4541 (AISI 321) 1.4571 (AISI 316Ti) 1.4401 (AISI 316) 1.4435 (AISI 316L) 1.4539 (AISI 904L) 1.4016 (AISI 430) 1.4021 (AISI 420A) 1.4034 (AISI 420B) 1.4057 (AISI 431) 1.4104 (AISI 430F) 1.4112 (AISI 440B) 1.4841 (AISI 314) 1.4842 (AISI 309) 1.4845 (AISI 310S)