STAS d-ring screw hanger set with steel wire - STAS picture hanging systems
Kerbl Bar ring met moer schroef, 10 x 120mm, 2 stuks | bol.com
2PCS M6*12/16 Extension Ring Schroef/Ring Schroef/Lange Schroef Ring Bolt| ring bolt|long screwscrew bolt - AliExpress
Ring (bevestigingsmiddel) - Wikipedia
5pcs/lot SZOEF 01 Iron plated white zinc ring screw M4 M5 M6 M8 With ring hook ring bolt closed sheep eye screw|screw m4|eye screwscrew screw - AliExpress
Ring (bevestigingsmiddel) - Wikipedia
Caruba 1/4 inch Screw with D-Ring Extra Long - Photospecialist
bouwdeal - Inox schroef met EPDM ring 4.5 x 60mm - 200 stuks