1. Ringlock scaffolding
Ringlock scaffolding yog ib hom scaffolding tshiab, siv dav hauv kev tsim kho choj siab, kev tsim kho qhov av, cog, cov pej thuam dej siab, cov chaw tsim hluav taws xob, cov chaw ua roj, cov chaw scaffolding, cov txee cia khoom, kho kom zoo nkauj sab hauv, kev tsim kho theem, cov chaw ua si bleachers thiab lwm yam haujlwm.