Secure Clamping - Holds steel rules firmly in place for accurate layout and measurement tasks across varying rule sizes. Versatile Fit - Accommodates rules of the same or different widths up to 1-1/4", ideal for flexible workshop setups. Precise Adjustments - Allows fine alignment of rules for enhanced measuring accuracy during layout or setup work. Compact & Convenient - Easy to store and transport, this clamp is perfect for mechanics needing to join rules for longer measurements, ideal for tool chests. The Standard for Excellence - Manufacturing quality tools that provide consistent and reliable performance since 1880, Starrett's commitment has earned them a reputation as one of the most trusted names in the industry.