Bi-hex sockets are a type of socket used for tightening and loosening bolts and nuts with hexagonal heads. They have a 12-point or 6-point design, with two sets of opposing hexagonal shapes on the socket, which allows them to fit onto bolts or nuts with either a 12-point or 6-point head.
A 1/2" square drive is a square-shaped opening on a tool or socket, which is designed to fit onto a 1/2 inch drive tool such as a ratchet or breaker bar. The square drive allows for torque to be applied to the tool or socket, allowing it to tighten or loosen nuts and bolts.
Bi-hex sockets for 1/2" square drive are available in a range of sizes, typically ranging from 10mm to 36mm. Some sets may include smaller or larger sizes depending on the intended use.