Question

the allen head has an internal____recess that the allen wrench fits in.
o a. octagonal
o b. hexagonal
o c. square
o d. triangular

Explanation:

Allen wrenches are designed to fit into hexagonal - shaped recesses. This is a standard design feature for Allen heads. Octagonal, square, and triangular recesses are not the typical design for Allen head - Allen wrench combinations.

Answer:

B. Hexagonal