Line pins are short metal stakes that can be inserted into a course of brickwork and are used to anchor and suspend a brick line between two points. Line pins are a fair alternative to line blocks though you may not be able to take a brick line around a corner as easily than you can with blocks.
A pair of sturdy nails can be used as a cheap alternative to line blocks or line pins. Secure a nail at either end of your wall and run a brick line between them. Note that nails do not have a leaf shaped blade to keep them from turning when set in between bricks, you may also find it difficult to secure them in wet mortar.
Mason’s clamps are handy tools that can be attached to a brick course so that a brick line can be suspended between two points. Mason’s clamps can be handy but many of these clamps are not designed for the width of a standard red house brick. They may be too small to grip properly.
Corner post profiles
Corner post profiles are metal posts that you can secure to a course of brickwork and to which you can attach a brick line. The post has an adjustable line holder that you can raise as your brick wall progresses. Corner post profiles have the advantage of not having reset pins or blocks for every course of bricks you lay, they are, however, more expensive and time consuming to install.