Black 2040 v slot aluminum profile with M5 thread What is v-Slot ? V-Slot is a high quality v slot aluminum profile building block that has an 90 degree chamfering v groove rail on all 4 sides. It's really a popular module for those desinger who used it to build theirs DIY prototyping. We also accept all types of custom products, such as CNC aluminum parts, welcome to send us your drawings for processing. How does it work? Building with V-Slot is much like working with lumber. You can cut it with a chop saw and the rest is as simple as turning a screwdriver to make the connections. V-Slot's building characteristics are much like traditional T-Slot but V-Slot then goes on to add new levels of functionality through it's internal v grooves that allow for linear motion. This brings your projects to life!