The FACOM S.232B is a 1/2" square drive F to 3/4" square drive M coupler, designed for use with impact wrenches. Made by the reputable brand Facom, this coupler allows for easy conversion between different sizes of square drives, ensuring a secure fit and efficient power transmission. Ideal for automotive maintenance and repair, this high-quality coupler is a versatile and essential tool for professionals and DIY enthusiasts alike.