Features: Sliding nut, suitable for aluminum extrusion profile t-slot. material: high quality stainless steel,have high hardness, surface is zinc-plated for good rust resistance. sliding nut can only be inserted into for t slot from the end profile, it owns the most excellent connection strength and reliability. Very easy to be slide into for t slot of aluminum profile. Aluminum profile sliding t-nuts widely used for building industrial aluminum frame structures, 3d printers, cnc routers, cnc laser cutters, robotics projects, etc. Easy installation: simply put the nut for head into the groove in the direction of the profile groove, and rotate it 90 degrees clockwise, it can automatically lock when it is installed. Package Includes: 4x T-slot Nuts 4x 3/8"-16 Screws 4x Nuts 4x Spacers Specifications: Material:Stainless Steel Size: Approx.16x9x1.5cm/6.29x3.54x0.59inch Applicable models: Tacoma, Tundra, trailer, pickup truck, SUV note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks for your understandings.