Greenline standard pinch clamps are zinc plated double-ear style. The double-ear clamps have a wider clamping range than single ear types. Please note that the dash size given is stamped on the clamp and refers to the closed and open size of the clamp. For example, a G2-1518 will fit over an 18 mm diameter tube and will clamp down to 15 mm if fully crimped. The maximum size listed also refers to the open size of the clamp in inches while the minimum size refers to the size of the clamp when fully crimped.