These microswitches are perfect as endstops on your 3D Printer, CNC machine, or anything else you need a microswitch for.
Check pictures for dimensions and specs

• 12 LM8UU Linear Bearings for 3D Printer. Prusa Mendel, reprap
• Steel Socket Cap Screw, Black Oxide, Plain Finish, Internal Hex Drive, Meets DIN 912, 30mm Length, Fully Threaded, M3-0.5 Metric Coarse Threads (Pack of 100)
• CNC Motor Shaft Coupler 5mm to 5mm Flexible Coupling 5x5mm
• B00FM5SC2Q
• Steel Hex Nut, M3-0.5 Threads, Made in US (Pack of 100)