Right angle anchor screws, also known as 7-shaped anchor screws or L-shaped anchor screws, are widely used in steel structure embedment and for anchoring and fixing mechanical equipment bases. They are often made of materials such as Q235B and Q355B, which have good cold bending performance, moderate mechanical performance, and relatively low cost. The commonly used specifications are M16-M42, M16 is generally used for pre embedding of street lamp foundations, small machinery, photovoltaic foundations, etc. M20 and above, mostly used in steel structure engineering.