Petzl COEUR mountain climbing anchor fabricated from steel, for interior use. The hanger, nut and bolt is a whole and sturdy assembly. The hanger features an anti-rotation system that helps to keep the hanger from turning when being installed. The hanger also includes a wide connection hole to make clipping in more uncomplicated, and to deal with 2 carabiners at one time.
Diameter: 12 mm, Length: 8.5 cm
Weight: 135 g every, Certifications: EN 795 A1, EN 959
Drilling depth: 9 cm, Drilling diameter: 12 mm
Pull-out strength in concrete 50 MPa: 25 kN
That is 20 Hangers and 20 Bolts.