These cleats have integral low friction roller fairleads. Material: aluminum CL230 is ideal for through-deck or through-mast applications where the line enters the cleat from below CL236 has a low friction roller fairlead, ideal for leading a line from above the cleat CL253 is designed for adjusting trapeze length and vang tensioning Approx. dimensions: 3-1/4"L x 11/16"W Part numbers ending in -1 represent retail packaging