Apex nutsetters. Apex male hex drive nutsetters allow nutrunning in all types of applications. Quality design and construction give Apex nutsetters a long service life and durability. Magnetic nutsetters hold the fastener in driving position, even when working straight down. Time-wasting motions are eliminated when starting fasteners or working in hard-to-reach areas. These nutsetters are identified with a M- prefix. Bolt clearance nutsetters allow the bolt or stud to recess into the nutsetter body as the nut is driven down. Bolt clearance nutsetters are prefixed with the numbers 6B-.