The term 'wrench type' can be solved by the word 'ALLEN', which is a five-letter word. An ALLEN wrench, also known as a hex key, is a tool used to drive bolts and screws that have a hexagonal socket in the head. It is usually made of steel and is L-shaped with a hexagonal cross section. The ends are usually ball-shaped, allowing it to be used in tight spaces. The ALLEN wrench is commonly used in the assembly of furniture, bicycles, and other items.