The purpose of this app is to familiarize the user with the 32 most common types of screws and bolts that you are likely to find on a construction site, on a production line, in a workshop or in the hardware store.

The images and descriptions provided are useful for amateur do-it-yourself (DIY) enthusiasts to understand what types of screws and bolts are available and what they can be used for. The information is also useful for apprentices and trainees to increase their technical vocabulary. The information is even useful for 'old-timers' (like the author) who have used many different types of screws and bolts over our careers but never knew the 'proper' names of some of the less common types.