Dual-size wrench has a 9/16 head and a 15/16 head, for more versatility installing toilets, sinks, showerheads, and other installation projects. Riser mouth insert for use with dual-size wrench head, to keep the angle stop secure while tightening the back compression nut. Interlocking wrench body provides easy, compact storage. Chrome vanadium steel construction with a chrome-plated finish, for maximum corrosion resistance.