Material: Brass Inner Diameter: 2mm, 3mm, 3, 4mm, 5mm, 6mm, 7mm, 8mm Side Length: 7 Diagonal Distance: 13 Edge to Opposite Side: 12mm Total Height: 18mm Cylinder Height: 12mm Cylindrical Outer Diameter: 11~12mm Screw Hole Diameter: M4 Tolerance: ± zero Size: Package Included: Coupler x 1 M4 Screw x 2