50 Pack of Aluminum 2 Hole Joining Strip for 20mm Aluminum Extrusion Compatible with: 80/20 20 Series, Misumi 5 Series, Openbuilds V-Slot, Openbuilds C-Beam, and other standard v-slot/t-slot 20mm aluminum extrusions 2 M5 holes spaced 20mm apart in a line Dimensions: 17.9mmx40mmx4mm; Material: Aluminum Package contains 50 pieces