... 8"-5/16" diameter, medium clamp for 1/2"-3/4" dameter, and large clamp for 3/4" to 2-1 ... /2" diameter lines 3 Pieces Line Clamp SetUse to clamp fuel, vacuum, brake and cooling system lines.- Includes ... small clamp for 1/8"-5/16" diameter, medium clamp for 1/2"-3/4" dameter ... , and large clamp for 3/4" to 2-1 ...